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Fix bytecode live module lexical exports#675

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t3code/issue665
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Fix bytecode live module lexical exports#675
frostney wants to merge 1 commit into
mainfrom
t3code/issue665

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@frostney
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@frostney frostney commented May 20, 2026 •
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Summary

  • Fix bytecode module top-level lexical bindings so reassignment updates the module scope used for named exports.
  • Add module regression coverage for reassigned simple and destructured top-level lexical exports without relying on global ASI.
  • Move full-suite ASI/FFI coverage to per-folder goccia.json config, including tests/built-ins/FFI/goccia.json for FFI tests.
  • Update agent guidance, CI commands, and docs so default full-suite runs do not pass --asi or --unsafe-ffi globally.
  • Closes Bytecode module exports can read stale top-level let bindings #665.

Testing

  • Verified no regressions and confirmed the new feature or bugfix in end-to-end JavaScript/TypeScript tests
  • Updated documentation
  • Optional: Verified no regressions and confirmed the new feature or bugfix in native Pascal tests (if AST, scope, evaluator, or value types changed)
  • Optional: Verified no benchmark regressions or confirmed benchmark coverage for the change

Commands run:

  • ./build.pas loader repl benchmarkrunner testrunner
  • ./build/GocciaTestRunner tests/language/modules/live-bindings.js --silent --no-progress
  • ./build/GocciaTestRunner tests/language/modules/live-bindings.js --mode=bytecode --silent --no-progress
  • ./build/GocciaTestRunner tests/built-ins/FFI --silent --no-progress
  • ./build/GocciaTestRunner tests/language/asi --silent --no-progress
  • ./build/GocciaTestRunner tests --silent --no-progress
  • ./build/GocciaTestRunner tests --mode=bytecode --silent --no-progress
  • ./build/GocciaScriptLoader /tmp/goccia-ffi-config.Ve2N4k/main.js --print (verified "unsafe-ffi": true config enables FFI without CLI flag)
  • ./format.pas --check

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coderabbitai Bot commented May 20, 2026 •
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github-actions Bot commented May 20, 2026 •
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Suite Timing

Test Runner (interpreted: 9,738 passed; bytecode: 9,738 passed)
Metric Interpreted Bytecode
Total 9738 9738
Passed 9738 ✅ 9738 ✅
Workers 4 4
Test Duration 3.01s 3.31s
Lex (cumulative) 408.4ms 346.7ms
Parse (cumulative) 276.1ms 304.8ms
Compile (cumulative) — 703.9ms
Execute (cumulative) 3.35s 3.25s
Engine Total (cumulative) 4.03s 4.61s
Lex (avg/worker) 102.1ms 86.7ms
Parse (avg/worker) 69.0ms 76.2ms
Compile (avg/worker) — 176.0ms
Execute (avg/worker) 837.4ms 813.1ms
Engine Total (avg/worker) 1.01s 1.15s

Memory

GC rows aggregate the main thread plus all worker thread-local GCs. Test runner worker shutdown frees thread-local heaps in bulk; that shutdown reclamation is not counted as GC collections or collected objects.

Metric Interpreted Bytecode
GC Live 278.72 MiB 273.03 MiB
GC Peak Live 278.73 MiB 273.04 MiB
GC Allocated During Run 283.17 MiB 277.49 MiB
GC Limit 7.81 GiB 7.81 GiB
GC Collections 1 1
GC Collected Objects 88 88
Heap Start Allocated 158.1 KiB 158.1 KiB
Heap End Allocated 1.53 MiB 1.53 MiB
Heap Delta Allocated 1.37 MiB 1.37 MiB
Heap Delta Free 707.5 KiB 707.5 KiB
Benchmarks (interpreted: 407; bytecode: 407)
Metric Interpreted Bytecode
Total 407 407
Workers 4 4
Duration 2.42min 2.23min

Memory

GC rows aggregate the main thread plus all worker thread-local GCs. Benchmark runner performs explicit between-file collections, so collection and collected-object counts can be much higher than the test runner.

Metric Interpreted Bytecode
GC Live 3.93 MiB 3.92 MiB
GC Peak Live 115.99 MiB 60.91 MiB
GC Allocated During Run 14.74 GiB 9.29 GiB
GC Limit 7.81 GiB 7.81 GiB
GC Collections 2,807 2,661
GC Collected Objects 267,776,611 215,058,577
Heap Start Allocated 1.27 MiB 1.27 MiB
Heap End Allocated 1.27 MiB 1.27 MiB
Heap Delta Allocated 128 B 128 B

Measured on ubuntu-latest x64.

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github-actions Bot commented May 20, 2026 •
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Benchmark Results

407 benchmarks

Interpreted: 🟢 48 improved · 🔴 162 regressed · 197 unchanged · avg -1.9%
Bytecode: 🟢 22 improved · 🔴 357 regressed · 28 unchanged · avg -8.2%

arraybuffer.js — Interp: 🟢 4, 🔴 5, 5 unch. · avg +0.3% · Bytecode: 🟢 1, 🔴 11, 2 unch. · avg -8.4%
Benchmark Interpreted Δ Bytecode Δ
create ArrayBuffer(0) 167,523 ops/sec [145,811..168,241] → 166,590 ops/sec [130,820..171,441] ~ overlap (-0.6%) 189,551 ops/sec [171,000..210,250] → 178,927 ops/sec [164,428..190,637] ~ overlap (-5.6%)
create ArrayBuffer(64) 167,051 ops/sec [166,286..167,555] → 163,677 ops/sec [162,589..164,373] 🔴 -2.0% 205,032 ops/sec [198,934..208,163] → 180,598 ops/sec [178,689..183,215] 🔴 -11.9%
create ArrayBuffer(1024) 142,153 ops/sec [140,521..144,541] → 147,336 ops/sec [144,894..147,799] 🟢 +3.6% 165,853 ops/sec [121,620..168,095] → 156,909 ops/sec [154,978..159,769] ~ overlap (-5.4%)
create ArrayBuffer(8192) 74,516 ops/sec [73,671..74,769] → 86,714 ops/sec [84,398..88,329] 🟢 +16.4% 82,804 ops/sec [81,054..84,437] → 86,432 ops/sec [85,380..87,063] 🟢 +4.4%
slice full buffer (64 bytes) 198,447 ops/sec [195,825..200,567] → 192,382 ops/sec [190,322..195,467] 🔴 -3.1% 248,817 ops/sec [247,725..251,810] → 227,533 ops/sec [225,059..229,675] 🔴 -8.6%
slice half buffer (512 of 1024 bytes) 176,491 ops/sec [167,527..179,386] → 174,780 ops/sec [173,759..175,594] ~ overlap (-1.0%) 219,903 ops/sec [218,099..225,812] → 205,524 ops/sec [205,032..206,414] 🔴 -6.5%
slice with negative indices 161,476 ops/sec [154,633..166,464] → 160,788 ops/sec [158,181..161,651] ~ overlap (-0.4%) 235,483 ops/sec [224,779..237,735] → 212,524 ops/sec [211,447..213,303] 🔴 -9.7%
slice empty range 185,392 ops/sec [183,911..187,021] → 194,728 ops/sec [192,845..196,605] 🟢 +5.0% 245,984 ops/sec [243,785..246,899] → 215,112 ops/sec [178,437..223,797] 🔴 -12.6%
byteLength access 456,145 ops/sec [455,086..459,279] → 416,800 ops/sec [414,069..418,541] 🔴 -8.6% 460,111 ops/sec [454,057..462,356] → 419,034 ops/sec [411,086..422,457] 🔴 -8.9%
Symbol.toStringTag access 366,784 ops/sec [357,141..370,473] → 334,177 ops/sec [332,185..335,712] 🔴 -8.9% 337,612 ops/sec [334,277..341,026] → 302,496 ops/sec [298,954..307,502] 🔴 -10.4%
ArrayBuffer.isView 263,065 ops/sec [253,559..263,307] → 258,957 ops/sec [256,674..259,882] ~ overlap (-1.6%) 321,466 ops/sec [321,054..323,112] → 274,450 ops/sec [274,017..278,587] 🔴 -14.6%
clone ArrayBuffer(64) 173,884 ops/sec [173,668..174,810] → 179,505 ops/sec [177,453..180,307] 🟢 +3.2% 221,222 ops/sec [216,914..224,072] → 199,621 ops/sec [197,744..203,697] 🔴 -9.8%
clone ArrayBuffer(1024) 149,021 ops/sec [146,557..156,637] → 157,207 ops/sec [156,108..157,814] ~ overlap (+5.5%) 182,231 ops/sec [180,055..183,040] → 167,615 ops/sec [166,413..170,260] 🔴 -8.0%
clone ArrayBuffer inside object 124,566 ops/sec [120,970..125,059] → 120,355 ops/sec [119,913..120,560] 🔴 -3.4% 142,801 ops/sec [139,919..143,223] → 127,871 ops/sec [126,483..128,638] 🔴 -10.5%
arrays.js — Interp: 🟢 1, 🔴 6, 12 unch. · avg -2.2% · Bytecode: 🔴 19 · avg -11.6%
Benchmark Interpreted Δ Bytecode Δ
Array.from length 100 4,008 ops/sec [3,987..4,045] → 3,944 ops/sec [3,375..4,034] ~ overlap (-1.6%) 6,100 ops/sec [5,710..6,178] → 5,307 ops/sec [5,043..5,351] 🔴 -13.0%
Array.from 10 elements 95,812 ops/sec [95,111..96,203] → 90,994 ops/sec [90,685..91,729] 🔴 -5.0% 104,171 ops/sec [101,563..104,741] → 93,684 ops/sec [91,792..95,053] 🔴 -10.1%
Array.of 10 elements 118,576 ops/sec [118,280..119,028] → 111,268 ops/sec [108,495..111,520] 🔴 -6.2% 131,731 ops/sec [130,317..132,277] → 117,709 ops/sec [115,926..120,117] 🔴 -10.6%
spread into new array 137,930 ops/sec [132,202..146,654] → 135,326 ops/sec [121,057..139,415] ~ overlap (-1.9%) 81,180 ops/sec [78,803..83,634] → 75,122 ops/sec [72,087..75,421] 🔴 -7.5%
map over 50 elements 6,684 ops/sec [6,277..6,716] → 6,786 ops/sec [6,765..6,801] 🟢 +1.5% 10,944 ops/sec [10,705..11,170] → 9,789 ops/sec [9,602..9,850] 🔴 -10.6%
filter over 50 elements 7,182 ops/sec [7,151..7,244] → 6,628 ops/sec [6,595..6,658] 🔴 -7.7% 11,752 ops/sec [11,663..11,810] → 9,668 ops/sec [9,604..9,739] 🔴 -17.7%
reduce sum 50 elements 7,823 ops/sec [7,664..7,923] → 6,989 ops/sec [6,927..7,021] 🔴 -10.7% 11,679 ops/sec [11,626..11,742] → 10,240 ops/sec [5,199..10,415] 🔴 -12.3%
forEach over 50 elements 6,450 ops/sec [6,363..6,602] → 6,326 ops/sec [6,278..6,395] ~ overlap (-1.9%) 12,438 ops/sec [12,264..12,534] → 11,165 ops/sec [11,002..11,225] 🔴 -10.2%
find in 50 elements 9,285 ops/sec [9,105..9,406] → 9,171 ops/sec [9,110..9,240] ~ overlap (-1.2%) 16,539 ops/sec [16,483..16,642] → 14,830 ops/sec [14,769..14,862] 🔴 -10.3%
sort 20 elements 3,712 ops/sec [3,481..3,830] → 3,473 ops/sec [3,425..3,511] ~ overlap (-6.4%) 6,476 ops/sec [6,432..6,480] → 5,671 ops/sec [5,598..5,782] 🔴 -12.4%
flat nested array 49,891 ops/sec [49,319..50,605] → 48,677 ops/sec [48,485..48,933] 🔴 -2.4% 58,410 ops/sec [58,023..58,893] → 51,521 ops/sec [51,237..52,308] 🔴 -11.8%
flatMap 27,612 ops/sec [27,300..28,114] → 28,022 ops/sec [27,650..28,451] ~ overlap (+1.5%) 36,827 ops/sec [35,893..37,456] → 32,600 ops/sec [32,200..32,856] 🔴 -11.5%
map inside map (5x5) 7,158 ops/sec [7,084..7,226] → 7,269 ops/sec [7,145..7,275] ~ overlap (+1.5%) 10,556 ops/sec [10,406..10,697] → 9,219 ops/sec [9,142..9,320] 🔴 -12.7%
filter inside map (5x10) 5,073 ops/sec [4,965..5,128] → 5,079 ops/sec [5,063..5,109] ~ overlap (+0.1%) 8,162 ops/sec [8,089..8,212] → 7,086 ops/sec [7,027..7,115] 🔴 -13.2%
reduce inside map (5x10) 5,696 ops/sec [5,561..5,815] → 5,630 ops/sec [5,594..5,703] ~ overlap (-1.2%) 8,921 ops/sec [8,839..8,978] → 7,639 ops/sec [7,557..7,747] 🔴 -14.4%
forEach inside forEach (5x10) 5,154 ops/sec [5,137..5,170] → 5,067 ops/sec [5,003..5,084] 🔴 -1.7% 9,082 ops/sec [9,058..9,094] → 8,161 ops/sec [8,015..8,274] 🔴 -10.1%
find inside some (10x10) 4,096 ops/sec [4,059..4,129] → 4,129 ops/sec [4,081..4,134] ~ overlap (+0.8%) 6,627 ops/sec [6,545..6,705] → 5,852 ops/sec [5,849..5,899] 🔴 -11.7%
map+filter chain nested (5x20) 1,542 ops/sec [1,475..1,577] → 1,554 ops/sec [1,532..1,564] ~ overlap (+0.8%) 2,480 ops/sec [2,443..2,508] → 2,199 ops/sec [2,193..2,207] 🔴 -11.4%
reduce flatten (10x5) 16,446 ops/sec [16,253..16,469] → 16,506 ops/sec [16,369..16,648] ~ overlap (+0.4%) 7,489 ops/sec [7,437..7,528] → 6,804 ops/sec [6,699..6,855] 🔴 -9.1%
async-await.js — Interp: 🟢 2, 4 unch. · avg +2.4% · Bytecode: 🔴 5, 1 unch. · avg -10.5%
Benchmark Interpreted Δ Bytecode Δ
single await 151,770 ops/sec [115,505..152,971] → 150,562 ops/sec [115,083..153,567] ~ overlap (-0.8%) 161,885 ops/sec [116,406..165,646] → 147,596 ops/sec [96,427..151,824] ~ overlap (-8.8%)
multiple awaits 70,967 ops/sec [68,288..73,121] → 72,325 ops/sec [71,746..72,468] ~ overlap (+1.9%) 72,996 ops/sec [72,245..75,406] → 66,599 ops/sec [65,795..67,470] 🔴 -8.8%
await non-Promise value 284,607 ops/sec [281,103..287,672] → 294,719 ops/sec [292,825..295,758] 🟢 +3.6% 409,829 ops/sec [402,585..416,550] → 372,310 ops/sec [368,277..377,779] 🔴 -9.2%
await with try/catch 119,800 ops/sec [118,595..120,255] → 125,687 ops/sec [124,311..126,218] 🟢 +4.9% 162,442 ops/sec [157,480..166,227] → 140,713 ops/sec [139,918..142,208] 🔴 -13.4%
await Promise.all 24,077 ops/sec [23,593..24,311] → 23,792 ops/sec [23,024..23,997] ~ overlap (-1.2%) 24,362 ops/sec [24,208..24,458] → 21,586 ops/sec [21,177..21,770] 🔴 -11.4%
nested async function call 74,984 ops/sec [62,055..78,325] → 79,614 ops/sec [77,486..81,309] ~ overlap (+6.2%) 100,728 ops/sec [98,527..101,405] → 88,931 ops/sec [87,948..90,296] 🔴 -11.7%
async-generators.js — Interp: 2 unch. · avg +0.2% · Bytecode: 🔴 2 · avg -11.7%
Benchmark Interpreted Δ Bytecode Δ
for-await-of over async generator 2,285 ops/sec [2,229..2,296] → 2,318 ops/sec [2,219..2,336] ~ overlap (+1.5%) 2,691 ops/sec [2,650..2,715] → 2,346 ops/sec [1,691..2,360] 🔴 -12.8%
async generator with await in body 21,708 ops/sec [21,379..21,913] → 21,473 ops/sec [21,295..21,675] ~ overlap (-1.1%) 23,215 ops/sec [21,950..23,342] → 20,743 ops/sec [20,492..20,869] 🔴 -10.6%
base64.js — Interp: 🟢 7, 3 unch. · avg +7.0% · Bytecode: 🟢 6, 🔴 3, 1 unch. · avg -0.7%
Benchmark Interpreted Δ Bytecode Δ
short ASCII (13 chars) 3,754 ops/sec [3,677..3,819] → 3,680 ops/sec [3,625..3,722] ~ overlap (-2.0%) 3,737 ops/sec [3,676..3,778] → 3,257 ops/sec [3,225..3,270] 🔴 -12.8%
medium ASCII (450 chars) 136 ops/sec [135..136] → 141 ops/sec [131..143] ~ overlap (+3.3%) 140 ops/sec [139..146] → 127 ops/sec [124..129] 🔴 -9.3%
Latin-1 characters 5,441 ops/sec [5,220..5,502] → 5,377 ops/sec [5,352..5,413] ~ overlap (-1.2%) 5,676 ops/sec [5,640..5,698] → 4,835 ops/sec [4,799..4,850] 🔴 -14.8%
short base64 (20 chars) 665 ops/sec [664..665] → 726 ops/sec [719..727] 🟢 +9.2% 676 ops/sec [674..681] → 699 ops/sec [694..701] 🟢 +3.3%
medium base64 (600 chars) 24 ops/sec [24..24] → 27 ops/sec [27..27] 🟢 +11.8% 24 ops/sec [24..25] → 26 ops/sec [26..26] 🟢 +7.3%
Latin-1 output 1,047 ops/sec [1,046..1,054] → 1,147 ops/sec [1,143..1,159] 🟢 +9.6% 1,059 ops/sec [1,048..1,064] → 1,094 ops/sec [1,084..1,126] 🟢 +3.4%
forgiving (no padding) 1,628 ops/sec [1,610..1,633] → 1,801 ops/sec [1,787..1,812] 🟢 +10.7% 1,647 ops/sec [1,617..1,711] → 1,717 ops/sec [1,707..1,719] ~ overlap (+4.3%)
with whitespace 622 ops/sec [617..634] → 690 ops/sec [686..694] 🟢 +10.9% 630 ops/sec [625..632] → 659 ops/sec [656..665] 🟢 +4.6%
atob(btoa(short)) 560 ops/sec [546..576] → 611 ops/sec [608..617] 🟢 +9.2% 571 ops/sec [568..574] → 586 ops/sec [581..593] 🟢 +2.5%
atob(btoa(medium)) 21 ops/sec [20..21] → 22 ops/sec [22..22] 🟢 +8.4% 21 ops/sec [21..21] → 22 ops/sec [21..22] 🟢 +4.7%
classes.js — Interp: 🟢 1, 🔴 2, 28 unch. · avg -0.2% · Bytecode: 🔴 23, 8 unch. · avg -6.9%
Benchmark Interpreted Δ Bytecode Δ
simple class new 57,649 ops/sec [57,347..58,081] → 58,206 ops/sec [57,424..58,714] ~ overlap (+1.0%) 75,790 ops/sec [72,064..76,655] → 71,371 ops/sec [70,384..72,110] ~ overlap (-5.8%)
class with defaults 44,290 ops/sec [43,813..44,368] → 42,951 ops/sec [42,704..43,135] 🔴 -3.0% 50,047 ops/sec [50,000..50,201] → 45,159 ops/sec [44,961..45,212] 🔴 -9.8%
50 instances via Array.from 1,952 ops/sec [1,905..1,982] → 1,957 ops/sec [1,948..1,969] ~ overlap (+0.2%) 2,606 ops/sec [2,545..2,676] → 2,333 ops/sec [2,295..2,356] 🔴 -10.5%
instance method call 27,312 ops/sec [27,200..27,394] → 27,363 ops/sec [27,115..27,548] ~ overlap (+0.2%) 36,506 ops/sec [36,441..36,537] → 31,821 ops/sec [31,506..32,409] 🔴 -12.8%
static method call 46,804 ops/sec [43,385..47,257] → 44,920 ops/sec [44,478..45,174] ~ overlap (-4.0%) 78,589 ops/sec [78,292..79,532] → 72,065 ops/sec [70,202..73,954] 🔴 -8.3%
single-level inheritance 24,492 ops/sec [24,057..24,663] → 22,888 ops/sec [22,854..22,939] 🔴 -6.6% 28,173 ops/sec [27,650..28,495] → 25,591 ops/sec [25,385..25,781] 🔴 -9.2%
two-level inheritance 20,152 ops/sec [19,992..20,251] → 19,931 ops/sec [19,733..20,109] ~ overlap (-1.1%) 22,631 ops/sec [22,444..22,773] → 20,778 ops/sec [20,536..20,956] 🔴 -8.2%
private field access 30,973 ops/sec [30,532..31,552] → 30,570 ops/sec [30,078..30,851] ~ overlap (-1.3%) 26,232 ops/sec [26,191..26,288] → 24,047 ops/sec [23,891..24,278] 🔴 -8.3%
private methods 34,308 ops/sec [33,579..34,619] → 34,041 ops/sec [33,419..34,297] ~ overlap (-0.8%) 30,201 ops/sec [29,837..30,309] → 27,388 ops/sec [26,233..27,934] 🔴 -9.3%
getter/setter access 30,556 ops/sec [30,268..30,886] → 30,205 ops/sec [29,904..30,527] ~ overlap (-1.1%) 41,695 ops/sec [34,179..42,081] → 38,202 ops/sec [38,051..38,498] ~ overlap (-8.4%)
class decorator (identity) 41,377 ops/sec [40,515..41,949] → 40,995 ops/sec [40,387..41,279] ~ overlap (-0.9%) 44,890 ops/sec [44,464..45,349] → 41,394 ops/sec [41,081..42,046] 🔴 -7.8%
class decorator (wrapping) 23,831 ops/sec [23,690..24,354] → 23,969 ops/sec [23,721..24,378] ~ overlap (+0.6%) 24,317 ops/sec [23,878..25,094] → 22,626 ops/sec [22,391..22,833] 🔴 -7.0%
identity method decorator 29,636 ops/sec [29,452..29,905] → 29,225 ops/sec [28,867..29,750] ~ overlap (-1.4%) 37,054 ops/sec [36,682..38,577] → 34,445 ops/sec [34,273..34,513] 🔴 -7.0%
wrapping method decorator 24,208 ops/sec [23,975..24,365] → 23,764 ops/sec [23,615..24,134] ~ overlap (-1.8%) 27,911 ops/sec [26,919..28,705] → 26,080 ops/sec [25,746..26,712] 🔴 -6.6%
stacked method decorators (x3) 16,533 ops/sec [16,317..16,711] → 16,439 ops/sec [16,095..16,565] ~ overlap (-0.6%) 20,493 ops/sec [19,592..21,068] → 18,495 ops/sec [18,259..18,900] 🔴 -9.8%
identity field decorator 33,720 ops/sec [33,022..34,760] → 33,051 ops/sec [32,842..33,244] ~ overlap (-2.0%) 34,206 ops/sec [34,095..34,524] → 32,966 ops/sec [32,228..33,946] 🔴 -3.6%
field initializer decorator 27,749 ops/sec [27,501..28,018] → 27,752 ops/sec [27,330..27,918] ~ overlap (+0.0%) 30,360 ops/sec [30,021..31,144] → 28,118 ops/sec [27,426..28,948] 🔴 -7.4%
getter decorator (identity) 29,890 ops/sec [29,785..30,382] → 29,835 ops/sec [29,783..29,971] ~ overlap (-0.2%) 29,388 ops/sec [29,335..29,537] → 28,192 ops/sec [28,109..28,458] 🔴 -4.1%
setter decorator (identity) 24,386 ops/sec [24,295..24,913] → 24,532 ops/sec [24,354..24,614] ~ overlap (+0.6%) 24,089 ops/sec [23,817..24,683] → 22,508 ops/sec [21,855..22,609] 🔴 -6.6%
static method decorator 30,910 ops/sec [30,643..31,218] → 30,832 ops/sec [30,036..31,251] ~ overlap (-0.3%) 41,506 ops/sec [40,631..41,716] → 36,581 ops/sec [35,415..36,963] 🔴 -11.9%
static field decorator 37,030 ops/sec [36,880..37,125] → 37,049 ops/sec [36,826..38,032] ~ overlap (+0.1%) 40,503 ops/sec [39,627..41,737] → 39,413 ops/sec [38,449..40,014] ~ overlap (-2.7%)
private method decorator 24,672 ops/sec [24,327..25,342] → 24,696 ops/sec [24,524..24,743] ~ overlap (+0.1%) 28,611 ops/sec [27,942..29,697] → 27,778 ops/sec [27,287..28,241] ~ overlap (-2.9%)
private field decorator 27,321 ops/sec [26,964..27,807] → 27,110 ops/sec [26,908..27,260] ~ overlap (-0.8%) 26,269 ops/sec [24,554..26,531] → 24,482 ops/sec [24,296..24,564] ~ overlap (-6.8%)
plain auto-accessor (no decorator) 46,990 ops/sec [46,172..49,441] → 47,852 ops/sec [46,138..49,948] ~ overlap (+1.8%) 43,350 ops/sec [43,033..44,395] → 42,208 ops/sec [41,494..42,586] 🔴 -2.6%
auto-accessor with decorator 25,406 ops/sec [24,973..26,303] → 26,205 ops/sec [24,979..26,562] ~ overlap (+3.1%) 26,810 ops/sec [22,753..27,380] → 25,589 ops/sec [24,931..26,739] ~ overlap (-4.6%)
decorator writing metadata 20,815 ops/sec [20,509..21,238] → 20,581 ops/sec [20,274..20,917] ~ overlap (-1.1%) 23,026 ops/sec [22,522..23,735] → 22,142 ops/sec [21,863..23,339] ~ overlap (-3.8%)
static getter read 53,480 ops/sec [53,082..53,938] → 54,228 ops/sec [53,619..54,674] ~ overlap (+1.4%) 72,310 ops/sec [71,020..73,494] → 67,126 ops/sec [66,636..69,272] 🔴 -7.2%
static getter/setter pair 40,469 ops/sec [40,095..40,800] → 40,741 ops/sec [40,176..41,295] ~ overlap (+0.7%) 53,488 ops/sec [50,641..54,798] → 49,312 ops/sec [48,758..49,897] 🔴 -7.8%
inherited static getter 34,174 ops/sec [33,721..34,280] → 35,622 ops/sec [35,495..36,261] 🟢 +4.2% 42,635 ops/sec [40,804..44,236] → 41,240 ops/sec [40,597..41,882] ~ overlap (-3.3%)
inherited static setter 36,854 ops/sec [36,696..37,507] → 37,732 ops/sec [37,481..37,950] ~ overlap (+2.4%) 43,565 ops/sec [42,764..44,057] → 41,940 ops/sec [41,191..42,681] 🔴 -3.7%
inherited static getter with this binding 29,902 ops/sec [29,847..29,975] → 30,822 ops/sec [29,955..30,933] ~ overlap (+3.1%) 35,589 ops/sec [35,376..36,535] → 33,356 ops/sec [33,042..34,201] 🔴 -6.3%
closures.js — Interp: 🔴 7, 4 unch. · avg -2.9% · Bytecode: 🔴 11 · avg -10.5%
Benchmark Interpreted Δ Bytecode Δ
closure over single variable 48,944 ops/sec [47,963..49,064] → 46,399 ops/sec [45,053..46,675] 🔴 -5.2% 152,200 ops/sec [148,885..153,462] → 136,105 ops/sec [132,649..137,159] 🔴 -10.6%
closure over multiple variables 50,028 ops/sec [49,675..50,242] → 47,528 ops/sec [46,988..47,877] 🔴 -5.0% 134,081 ops/sec [132,148..135,397] → 121,219 ops/sec [118,785..122,483] 🔴 -9.6%
nested closures 51,863 ops/sec [51,685..55,285] → 53,175 ops/sec [52,603..53,793] ~ overlap (+2.5%) 133,347 ops/sec [130,972..134,303] → 120,870 ops/sec [119,373..121,703] 🔴 -9.4%
function as argument 35,250 ops/sec [34,917..35,373] → 34,091 ops/sec [33,847..35,007] ~ overlap (-3.3%) 133,892 ops/sec [131,176..136,961] → 117,458 ops/sec [116,140..117,997] 🔴 -12.3%
function returning function 45,645 ops/sec [44,766..46,171] → 45,210 ops/sec [44,676..45,826] ~ overlap (-1.0%) 153,694 ops/sec [149,347..156,849] → 136,715 ops/sec [134,579..138,702] 🔴 -11.0%
compose two functions 27,817 ops/sec [27,594..28,244] → 27,508 ops/sec [27,210..27,792] ~ overlap (-1.1%) 88,017 ops/sec [85,236..89,253] → 79,722 ops/sec [75,658..80,347] 🔴 -9.4%
fn.call 64,246 ops/sec [63,301..64,977] → 60,847 ops/sec [60,469..61,864] 🔴 -5.3% 93,888 ops/sec [93,658..94,571] → 86,193 ops/sec [85,410..86,641] 🔴 -8.2%
fn.apply 49,993 ops/sec [49,616..50,470] → 47,830 ops/sec [47,252..48,079] 🔴 -4.3% 92,408 ops/sec [90,128..95,171] → 85,044 ops/sec [84,491..86,196] 🔴 -8.0%
fn.bind 54,136 ops/sec [53,945..54,494] → 52,826 ops/sec [52,578..53,514] 🔴 -2.4% 129,049 ops/sec [126,200..135,935] → 115,230 ops/sec [114,302..116,952] 🔴 -10.7%
recursive sum to 50 4,134 ops/sec [4,105..4,162] → 3,962 ops/sec [3,941..3,987] 🔴 -4.1% 18,218 ops/sec [17,806..18,900] → 15,679 ops/sec [15,647..15,718] 🔴 -13.9%
recursive tree traversal 7,382 ops/sec [7,340..7,438] → 7,221 ops/sec [7,130..7,238] 🔴 -2.2% 15,646 ops/sec [15,312..15,848] → 13,763 ops/sec [13,704..13,846] 🔴 -12.0%
collections.js — Interp: 🟢 3, 🔴 2, 7 unch. · avg +0.3% · Bytecode: 🔴 12 · avg -12.6%
Benchmark Interpreted Δ Bytecode Δ
add 50 elements 3,228 ops/sec [3,180..3,269] → 3,258 ops/sec [3,225..3,284] ~ overlap (+0.9%) 3,677 ops/sec [3,642..3,693] → 3,171 ops/sec [3,164..3,192] 🔴 -13.8%
has lookup (50 elements) 48,424 ops/sec [47,957..48,687] → 49,479 ops/sec [49,326..49,678] 🟢 +2.2% 54,536 ops/sec [52,248..54,988] → 46,197 ops/sec [45,719..46,434] 🔴 -15.3%
delete elements 26,702 ops/sec [26,488..26,950] → 26,844 ops/sec [26,799..27,159] ~ overlap (+0.5%) 28,720 ops/sec [28,440..28,782] → 23,774 ops/sec [23,326..23,864] 🔴 -17.2%
forEach iteration 5,477 ops/sec [5,263..5,612] → 5,386 ops/sec [5,337..5,476] ~ overlap (-1.6%) 8,950 ops/sec [8,773..9,047] → 7,754 ops/sec [7,673..7,935] 🔴 -13.4%
spread to array 14,968 ops/sec [14,829..15,140] → 14,149 ops/sec [14,046..14,197] 🔴 -5.5% 109,646 ops/sec [108,374..111,109] → 103,559 ops/sec [102,844..105,830] 🔴 -5.6%
deduplicate array 20,888 ops/sec [20,498..21,248] → 20,587 ops/sec [20,530..20,662] ~ overlap (-1.4%) 39,024 ops/sec [38,901..39,120] → 33,900 ops/sec [33,823..34,146] 🔴 -13.1%
set 50 entries 2,324 ops/sec [2,251..2,406] → 2,397 ops/sec [2,315..2,438] ~ overlap (+3.1%) 2,801 ops/sec [2,793..2,811] → 2,492 ops/sec [2,468..2,497] 🔴 -11.0%
get lookup (50 entries) 46,027 ops/sec [45,102..48,152] → 48,750 ops/sec [48,074..48,954] ~ overlap (+5.9%) 48,600 ops/sec [47,708..49,755] → 42,488 ops/sec [41,725..42,937] 🔴 -12.6%
has check 67,409 ops/sec [67,131..67,504] → 69,252 ops/sec [68,605..69,388] 🟢 +2.7% 72,863 ops/sec [72,241..74,028] → 62,998 ops/sec [62,334..63,846] 🔴 -13.5%
delete entries 25,774 ops/sec [25,295..26,313] → 26,560 ops/sec [26,401..26,845] 🟢 +3.0% 26,764 ops/sec [26,387..26,987] → 22,721 ops/sec [22,581..22,900] 🔴 -15.1%
forEach iteration 5,625 ops/sec [5,583..5,677] → 5,359 ops/sec [5,297..5,407] 🔴 -4.7% 9,093 ops/sec [8,892..9,187] → 7,864 ops/sec [7,789..7,903] 🔴 -13.5%
keys/values/entries 4,097 ops/sec [4,062..4,171] → 4,017 ops/sec [3,978..4,313] ~ overlap (-2.0%) 14,990 ops/sec [14,894..15,162] → 14,011 ops/sec [13,896..14,298] 🔴 -6.5%
csv.js — Interp: 🔴 13 · avg -8.4% · Bytecode: 🔴 11, 2 unch. · avg -9.1%
Benchmark Interpreted Δ Bytecode Δ
parse simple 3-column CSV 47,518 ops/sec [46,716..47,814] → 44,381 ops/sec [44,052..45,316] 🔴 -6.6% 50,151 ops/sec [49,266..50,508] → 45,194 ops/sec [44,036..45,550] 🔴 -9.9%
parse 10-row CSV 12,973 ops/sec [12,857..13,154] → 11,907 ops/sec [11,853..11,955] 🔴 -8.2% 13,275 ops/sec [13,091..13,404] → 12,094 ops/sec [12,083..12,293] 🔴 -8.9%
parse 100-row CSV 2,005 ops/sec [1,993..2,035] → 1,860 ops/sec [1,839..1,882] 🔴 -7.2% 2,039 ops/sec [2,031..2,064] → 1,897 ops/sec [1,853..1,923] 🔴 -6.9%
parse CSV with quoted fields 70,716 ops/sec [70,140..71,213] → 67,601 ops/sec [65,207..68,300] 🔴 -4.4% 73,558 ops/sec [73,211..73,628] → 67,356 ops/sec [66,130..68,293] 🔴 -8.4%
parse without headers (array of arrays) 6,025 ops/sec [5,990..6,143] → 5,638 ops/sec [5,609..5,913] 🔴 -6.4% 6,281 ops/sec [6,082..6,420] → 5,778 ops/sec [5,636..5,851] 🔴 -8.0%
parse with semicolon delimiter 9,306 ops/sec [9,202..9,357] → 8,626 ops/sec [8,593..8,722] 🔴 -7.3% 9,659 ops/sec [9,567..10,018] → 8,870 ops/sec [8,777..8,883] 🔴 -8.2%
stringify array of objects 73,880 ops/sec [73,778..74,024] → 63,422 ops/sec [62,764..63,494] 🔴 -14.2% 78,969 ops/sec [78,211..80,049] → 68,686 ops/sec [68,009..69,369] 🔴 -13.0%
stringify array of arrays 26,915 ops/sec [26,258..27,157] → 22,740 ops/sec [22,526..22,801] 🔴 -15.5% 26,985 ops/sec [26,782..27,829] → 23,886 ops/sec [23,785..24,245] 🔴 -11.5%
stringify with values needing escaping 55,798 ops/sec [55,588..56,145] → 48,173 ops/sec [47,735..50,087] 🔴 -13.7% 58,103 ops/sec [57,567..58,120] → 50,525 ops/sec [49,978..51,134] 🔴 -13.0%
reviver converts numbers 1,335 ops/sec [1,326..1,361] → 1,275 ops/sec [1,263..1,289] 🔴 -4.5% 1,463 ops/sec [1,438..1,529] → 1,324 ops/sec [1,313..1,335] 🔴 -9.5%
reviver filters empty to null 10,625 ops/sec [10,535..10,820] → 9,940 ops/sec [9,815..10,179] 🔴 -6.4% 12,996 ops/sec [12,928..13,365] → 11,719 ops/sec [11,546..11,823] 🔴 -9.8%
parse then stringify 8,225 ops/sec [8,157..8,441] → 7,523 ops/sec [7,444..7,590] 🔴 -8.5% 8,314 ops/sec [7,941..8,599] → 7,897 ops/sec [7,568..8,022] ~ overlap (-5.0%)
stringify then parse 7,996 ops/sec [7,941..8,110] → 7,469 ops/sec [7,383..7,715] 🔴 -6.6% 8,208 ops/sec [7,646..8,554] → 7,683 ops/sec [7,654..7,694] ~ overlap (-6.4%)
destructuring.js — Interp: 🟢 1, 🔴 7, 14 unch. · avg -1.7% · Bytecode: 🔴 21, 1 unch. · avg -9.0%
Benchmark Interpreted Δ Bytecode Δ
simple array destructuring 173,555 ops/sec [169,174..174,908] → 168,946 ops/sec [163,509..171,204] ~ overlap (-2.7%) 121,674 ops/sec [118,603..123,362] → 112,194 ops/sec [111,091..112,997] 🔴 -7.8%
with rest element 118,852 ops/sec [117,721..119,246] → 117,964 ops/sec [116,175..118,886] ~ overlap (-0.7%) 93,413 ops/sec [90,878..93,583] → 85,004 ops/sec [84,508..85,473] 🔴 -9.0%
with defaults 172,152 ops/sec [166,934..175,991] → 169,345 ops/sec [161,833..172,896] ~ overlap (-1.6%) 126,699 ops/sec [124,073..127,810] → 117,904 ops/sec [116,888..119,061] 🔴 -6.9%
skip elements 176,086 ops/sec [174,731..180,965] → 178,632 ops/sec [175,289..180,847] ~ overlap (+1.4%) 130,907 ops/sec [128,038..133,359] → 119,963 ops/sec [116,626..120,329] 🔴 -8.4%
nested array destructuring 84,917 ops/sec [84,288..85,699] → 86,572 ops/sec [83,961..87,341] ~ overlap (+1.9%) 45,618 ops/sec [43,613..46,345] → 40,198 ops/sec [39,651..40,905] 🔴 -11.9%
swap variables 198,416 ops/sec [194,136..206,456] → 202,482 ops/sec [197,077..203,603] ~ overlap (+2.0%) 158,679 ops/sec [141,488..161,628] → 146,451 ops/sec [145,397..147,222] ~ overlap (-7.7%)
simple object destructuring 132,792 ops/sec [129,791..134,296] → 126,795 ops/sec [126,045..126,983] 🔴 -4.5% 122,545 ops/sec [118,636..126,906] → 111,434 ops/sec [110,169..111,664] 🔴 -9.1%
with defaults 156,099 ops/sec [154,581..159,421] → 151,789 ops/sec [150,040..151,932] 🔴 -2.8% 194,719 ops/sec [185,191..196,736] → 170,085 ops/sec [166,859..176,060] 🔴 -12.7%
with renaming 144,260 ops/sec [141,560..146,101] → 138,058 ops/sec [135,414..138,661] 🔴 -4.3% 130,958 ops/sec [121,875..133,348] → 116,469 ops/sec [113,163..119,642] 🔴 -11.1%
nested object destructuring 69,968 ops/sec [69,467..72,057] → 69,986 ops/sec [68,802..71,513] ~ overlap (+0.0%) 64,491 ops/sec [62,506..69,912] → 60,508 ops/sec [59,069..61,876] 🔴 -6.2%
rest properties 53,722 ops/sec [53,161..55,352] → 49,914 ops/sec [49,260..50,561] 🔴 -7.1% 61,604 ops/sec [59,892..63,335] → 57,214 ops/sec [56,557..57,261] 🔴 -7.1%
object parameter 41,680 ops/sec [40,898..42,374] → 42,371 ops/sec [41,645..42,930] ~ overlap (+1.7%) 57,990 ops/sec [57,573..58,276] → 53,333 ops/sec [51,502..53,470] 🔴 -8.0%
array parameter 53,622 ops/sec [52,524..53,913] → 52,202 ops/sec [51,897..53,540] ~ overlap (-2.6%) 60,572 ops/sec [59,493..60,869] → 56,465 ops/sec [54,572..57,423] 🔴 -6.8%
mixed destructuring in map 12,217 ops/sec [12,107..12,354] → 11,728 ops/sec [11,657..12,182] ~ overlap (-4.0%) 16,354 ops/sec [15,985..16,468] → 14,961 ops/sec [14,669..15,350] 🔴 -8.5%
forEach with array destructuring 27,035 ops/sec [26,832..27,345] → 26,093 ops/sec [26,018..26,375] 🔴 -3.5% 22,715 ops/sec [22,423..22,788] → 21,634 ops/sec [21,034..21,749] 🔴 -4.8%
map with array destructuring 28,133 ops/sec [27,800..28,698] → 27,329 ops/sec [27,230..27,459] 🔴 -2.9% 22,232 ops/sec [21,954..22,373] → 20,054 ops/sec [19,938..20,511] 🔴 -9.8%
filter with array destructuring 29,491 ops/sec [29,070..29,565] → 28,097 ops/sec [27,961..28,216] 🔴 -4.7% 22,885 ops/sec [22,421..23,145] → 21,159 ops/sec [20,915..21,371] 🔴 -7.5%
reduce with array destructuring 31,271 ops/sec [30,434..31,425] → 30,563 ops/sec [30,392..30,598] ~ overlap (-2.3%) 24,140 ops/sec [23,746..24,315] → 21,883 ops/sec [21,635..22,152] 🔴 -9.3%
map with object destructuring 26,938 ops/sec [26,706..27,251] → 26,263 ops/sec [25,322..27,206] ~ overlap (-2.5%) 35,086 ops/sec [34,733..37,520] → 31,417 ops/sec [31,092..32,691] 🔴 -10.5%
map with nested destructuring 22,832 ops/sec [22,523..23,794] → 22,545 ops/sec [22,013..22,708] ~ overlap (-1.3%) 33,775 ops/sec [33,161..35,168] → 29,601 ops/sec [28,495..30,167] 🔴 -12.4%
map with rest in destructuring 17,220 ops/sec [16,996..17,475] → 17,820 ops/sec [17,659..17,969] 🟢 +3.5% 11,570 ops/sec [11,331..11,631] → 10,546 ops/sec [10,477..10,703] 🔴 -8.9%
map with defaults in destructuring 21,556 ops/sec [20,912..22,150] → 21,347 ops/sec [21,051..21,475] ~ overlap (-1.0%) 27,745 ops/sec [26,924..28,431] → 24,169 ops/sec [23,938..24,573] 🔴 -12.9%
fibonacci.js — Interp: 🔴 4, 4 unch. · avg -2.5% · Bytecode: 🔴 8 · avg -10.2%
Benchmark Interpreted Δ Bytecode Δ
recursive fib(15) 115 ops/sec [111..117] → 108 ops/sec [107..110] 🔴 -6.0% 489 ops/sec [486..508] → 434 ops/sec [418..444] 🔴 -11.3%
recursive fib(20) 10 ops/sec [10..10] → 10 ops/sec [10..10] ~ overlap (-1.6%) 44 ops/sec [42..44] → 39 ops/sec [38..40] 🔴 -10.4%
recursive fib(15) typed 113 ops/sec [110..118] → 111 ops/sec [109..113] ~ overlap (-1.5%) 493 ops/sec [480..508] → 437 ops/sec [417..444] 🔴 -11.3%
recursive fib(20) typed 10 ops/sec [10..10] → 10 ops/sec [10..10] ~ overlap (-1.4%) 45 ops/sec [44..47] → 40 ops/sec [35..42] 🔴 -11.4%
iterative fib(20) via reduce 4,852 ops/sec [4,742..4,982] → 4,853 ops/sec [4,798..4,875] ~ overlap (+0.0%) 9,358 ops/sec [8,829..9,705] → 8,304 ops/sec [8,205..8,344] 🔴 -11.3%
iterator fib(20) 3,580 ops/sec [3,565..3,587] → 3,495 ops/sec [3,478..3,528] 🔴 -2.4% 5,386 ops/sec [5,012..5,494] → 4,784 ops/sec [4,759..4,853] 🔴 -11.2%
iterator fib(20) via Iterator.from + take 4,658 ops/sec [4,573..4,697] → 4,505 ops/sec [4,463..4,541] 🔴 -3.3% 5,911 ops/sec [5,616..5,967] → 5,419 ops/sec [5,328..5,451] 🔴 -8.3%
iterator fib(20) last value via reduce 3,658 ops/sec [3,636..3,678] → 3,528 ops/sec [3,508..3,574] 🔴 -3.6% 4,630 ops/sec [4,387..4,881] → 4,343 ops/sec [4,289..4,387] 🔴 -6.2%
float16array.js — Interp: 🔴 18, 14 unch. · avg -6.1% · Bytecode: 🔴 30, 2 unch. · avg -9.0%
Benchmark Interpreted Δ Bytecode Δ
new Float16Array(0) 122,700 ops/sec [120,698..123,647] → 122,633 ops/sec [120,978..123,540] ~ overlap (-0.1%) 139,463 ops/sec [135,438..141,684] → 131,628 ops/sec [130,222..134,429] 🔴 -5.6%
new Float16Array(100) 119,061 ops/sec [117,246..122,030] → 118,373 ops/sec [116,934..119,358] ~ overlap (-0.6%) 136,167 ops/sec [130,940..140,774] → 125,081 ops/sec [124,617..128,568] 🔴 -8.1%
new Float16Array(1000) 98,643 ops/sec [96,445..99,636] → 100,713 ops/sec [99,573..102,374] ~ overlap (+2.1%) 110,927 ops/sec [108,625..115,427] → 105,384 ops/sec [104,703..107,713] 🔴 -5.0%
Float16Array.from([...100]) 4,142 ops/sec [4,094..4,179] → 3,848 ops/sec [3,745..3,915] 🔴 -7.1% 4,245 ops/sec [4,182..4,384] → 3,804 ops/sec [3,756..3,823] 🔴 -10.4%
Float16Array.of(1.5, 2.5, 3.5, 4.5, 5.5) 120,729 ops/sec [118,431..121,232] → 113,065 ops/sec [109,986..114,186] 🔴 -6.3% 102,452 ops/sec [100,964..102,862] → 95,474 ops/sec [93,674..96,911] 🔴 -6.8%
new Float16Array(float64Array) 34,201 ops/sec [33,892..34,640] → 26,130 ops/sec [25,756..26,444] 🔴 -23.6% 36,639 ops/sec [35,681..37,412] → 33,729 ops/sec [32,942..34,004] 🔴 -7.9%
sequential write 100 elements 985 ops/sec [931..1,009] → 1,001 ops/sec [999..1,005] ~ overlap (+1.6%) 2,108 ops/sec [2,090..2,151] → 1,998 ops/sec [1,957..2,006] 🔴 -5.2%
sequential read 100 elements 1,134 ops/sec [1,126..1,140] → 1,120 ops/sec [1,104..1,155] ~ overlap (-1.3%) 2,561 ops/sec [2,497..2,576] → 2,326 ops/sec [2,295..2,334] 🔴 -9.2%
write special values (NaN, Inf, -0) 34,997 ops/sec [34,033..36,052] → 32,543 ops/sec [32,275..33,600] 🔴 -7.0% 47,492 ops/sec [46,397..47,548] → 42,554 ops/sec [42,115..42,764] 🔴 -10.4%
Float16Array write 1,034 ops/sec [1,024..1,057] → 1,014 ops/sec [1,008..1,032] ~ overlap (-2.0%) 2,045 ops/sec [2,014..2,080] → 1,926 ops/sec [1,917..1,938] 🔴 -5.8%
Float32Array write 1,033 ops/sec [1,008..1,040] → 1,004 ops/sec [990..1,019] ~ overlap (-2.8%) 2,106 ops/sec [2,091..2,125] → 1,902 ops/sec [1,893..1,915] 🔴 -9.7%
Float64Array write 1,043 ops/sec [1,029..1,061] → 1,019 ops/sec [1,017..1,026] 🔴 -2.2% 2,077 ops/sec [2,073..2,097] → 1,944 ops/sec [1,920..1,951] 🔴 -6.4%
Float16Array read 1,074 ops/sec [1,070..1,095] → 1,075 ops/sec [1,072..1,081] ~ overlap (+0.1%) 2,436 ops/sec [2,406..2,450] → 2,043 ops/sec [2,037..2,077] 🔴 -16.2%
Float32Array read 1,131 ops/sec [1,126..1,143] → 1,094 ops/sec [1,072..1,115] 🔴 -3.3% 2,565 ops/sec [2,530..2,587] → 2,116 ops/sec [2,077..2,161] 🔴 -17.5%
Float64Array read 1,117 ops/sec [1,116..1,120] → 1,088 ops/sec [1,087..1,090] 🔴 -2.6% 2,512 ops/sec [2,469..2,656] → 2,105 ops/sec [2,089..2,165] 🔴 -16.2%
fill(1.5) 4,594 ops/sec [4,570..4,621] → 3,322 ops/sec [3,308..3,418] 🔴 -27.7% 4,622 ops/sec [4,596..4,713] → 4,114 ops/sec [4,081..4,125] 🔴 -11.0%
slice() 33,795 ops/sec [33,326..34,230] → 26,108 ops/sec [25,720..26,540] 🔴 -22.7% 35,531 ops/sec [35,237..36,162] → 32,113 ops/sec [31,891..32,300] 🔴 -9.6%
map(x => x * 2) 2,385 ops/sec [2,336..2,413] → 2,377 ops/sec [2,349..2,405] ~ overlap (-0.3%) 3,245 ops/sec [3,208..3,311] → 2,946 ops/sec [2,921..2,990] 🔴 -9.2%
filter(x => x > 25) 2,391 ops/sec [2,369..2,421] → 2,363 ops/sec [2,323..2,421] ~ overlap (-1.1%) 3,474 ops/sec [3,452..3,518] → 3,208 ops/sec [3,181..3,219] 🔴 -7.7%
reduce (sum) 2,549 ops/sec [2,532..2,566] → 2,524 ops/sec [2,492..2,530] 🔴 -1.0% 3,242 ops/sec [3,162..3,264] → 2,920 ops/sec [2,912..2,931] 🔴 -9.9%
sort() 9,972 ops/sec [9,942..10,038] → 9,456 ops/sec [9,379..9,527] 🔴 -5.2% 10,261 ops/sec [10,205..10,350] → 10,193 ops/sec [10,150..10,286] ~ overlap (-0.7%)
indexOf() 30,946 ops/sec [30,634..31,172] → 27,660 ops/sec [27,344..28,207] 🔴 -10.6% 31,693 ops/sec [31,459..32,412] → 28,217 ops/sec [28,169..28,537] 🔴 -11.0%
reverse() 36,772 ops/sec [36,426..37,157] → 28,102 ops/sec [27,919..28,165] 🔴 -23.6% 38,097 ops/sec [37,522..38,290] → 34,325 ops/sec [34,043..34,439] 🔴 -9.9%
toReversed() 25,896 ops/sec [25,832..25,968] → 22,829 ops/sec [22,669..22,909] 🔴 -11.8% 27,059 ops/sec [26,523..27,374] → 25,686 ops/sec [24,995..25,777] 🔴 -5.1%
toSorted() 365 ops/sec [361..366] → 337 ops/sec [334..340] 🔴 -7.5% 369 ops/sec [365..372] → 364 ops/sec [361..366] ~ overlap (-1.2%)
create view over existing buffer 138,958 ops/sec [135,826..142,775] → 134,714 ops/sec [131,892..136,377] ~ overlap (-3.1%) 161,029 ops/sec [157,965..164,454] → 147,648 ops/sec [147,388..147,941] 🔴 -8.3%
subarray() 162,873 ops/sec [159,963..168,648] → 152,459 ops/sec [151,373..154,190] 🔴 -6.4% 186,788 ops/sec [184,708..191,425] → 160,937 ops/sec [160,203..167,704] 🔴 -13.8%
set() from array 133,146 ops/sec [132,352..138,390] → 115,635 ops/sec [114,211..116,027] 🔴 -13.2% 146,128 ops/sec [143,668..149,960] → 133,051 ops/sec [131,802..135,379] 🔴 -8.9%
for-of loop 1,977 ops/sec [1,962..2,008] → 1,953 ops/sec [1,927..1,979] ~ overlap (-1.2%) 8,226 ops/sec [8,092..8,239] → 7,349 ops/sec [7,329..7,383] 🔴 -10.7%
spread into array 7,633 ops/sec [7,562..7,862] → 7,046 ops/sec [6,903..7,084] 🔴 -7.7% 28,437 ops/sec [27,856..28,554] → 26,224 ops/sec [26,010..26,552] 🔴 -7.8%
f16round(1.337) 263,013 ops/sec [258,319..266,736] → 261,972 ops/sec [258,124..266,497] ~ overlap (-0.4%) 252,813 ops/sec [249,984..254,712] → 224,206 ops/sec [222,279..224,761] 🔴 -11.3%
f16round over 100 values 1,456 ops/sec [1,424..1,488] → 1,494 ops/sec [1,468..1,500] ~ overlap (+2.5%) 3,081 ops/sec [3,057..3,115] → 2,713 ops/sec [2,679..2,733] 🔴 -12.0%
for-of.js — Interp: 🟢 1, 6 unch. · avg +1.7% · Bytecode: 🔴 7 · avg -11.1%
Benchmark Interpreted Δ Bytecode Δ
for...of with 10-element array 18,117 ops/sec [18,067..18,671] → 19,093 ops/sec [18,586..19,255] ~ overlap (+5.4%) 120,124 ops/sec [115,824..124,220] → 108,144 ops/sec [106,113..108,949] 🔴 -10.0%
for...of with 100-element array 2,153 ops/sec [2,047..2,237] → 2,178 ops/sec [2,127..2,186] ~ overlap (+1.2%) 15,940 ops/sec [15,718..16,151] → 14,104 ops/sec [14,021..14,424] 🔴 -11.5%
for...of with string (10 chars) 14,143 ops/sec [14,061..14,187] → 14,819 ops/sec [14,212..15,170] 🟢 +4.8% 34,934 ops/sec [34,440..35,614] → 30,800 ops/sec [30,270..30,896] 🔴 -11.8%
for...of with Set (10 elements) 19,087 ops/sec [18,799..19,302] → 19,006 ops/sec [18,315..20,297] ~ overlap (-0.4%) 118,080 ops/sec [115,844..119,451] → 103,458 ops/sec [102,671..103,670] 🔴 -12.4%
for...of with Map entries (10 entries) 13,090 ops/sec [12,933..13,179] → 13,058 ops/sec [12,718..13,229] ~ overlap (-0.2%) 17,274 ops/sec [17,024..17,416] → 15,512 ops/sec [15,392..15,945] 🔴 -10.2%
for...of with destructuring 16,001 ops/sec [15,891..16,504] → 15,992 ops/sec [15,923..16,168] ~ overlap (-0.1%) 22,301 ops/sec [22,071..22,485] → 20,313 ops/sec [19,940..20,779] 🔴 -8.9%
for-await-of with sync array 17,742 ops/sec [17,633..18,235] → 17,993 ops/sec [17,947..18,081] ~ overlap (+1.4%) 16,736 ops/sec [16,567..16,945] → 14,567 ops/sec [14,203..14,652] 🔴 -13.0%
generators.js — Interp: 🔴 1, 3 unch. · avg -3.5% · Bytecode: 🔴 4 · avg -12.6%
Benchmark Interpreted Δ Bytecode Δ
manual next over object generator 888 ops/sec [856..899] → 855 ops/sec [848..868] ~ overlap (-3.8%) 1,010 ops/sec [1,000..1,023] → 918 ops/sec [911..932] 🔴 -9.1%
for...of over object generator 1,320 ops/sec [1,306..1,330] → 1,285 ops/sec [1,247..1,322] ~ overlap (-2.6%) 1,968 ops/sec [1,853..2,009] → 1,697 ops/sec [1,682..1,703] 🔴 -13.8%
yield delegation 1,335 ops/sec [1,321..1,356] → 1,294 ops/sec [1,292..1,328] ~ overlap (-3.0%) 1,980 ops/sec [1,947..2,037] → 1,709 ops/sec [1,702..1,726] 🔴 -13.7%
class generator method 1,356 ops/sec [1,347..1,361] → 1,292 ops/sec [1,282..1,299] 🔴 -4.7% 1,979 ops/sec [1,959..1,985] → 1,708 ops/sec [1,676..1,722] 🔴 -13.7%
iterators.js — Interp: 🟢 4, 🔴 2, 36 unch. · avg +0.4% · Bytecode: 🔴 42 · avg -10.6%
Benchmark Interpreted Δ Bytecode Δ
Iterator.from({next}).toArray() — 20 elements 4,182 ops/sec [4,161..4,200] → 4,146 ops/sec [4,043..4,211] ~ overlap (-0.9%) 5,764 ops/sec [5,654..5,886] → 5,313 ops/sec [5,226..5,395] 🔴 -7.8%
Iterator.from({next}).toArray() — 50 elements 1,767 ops/sec [1,758..1,770] → 1,761 ops/sec [1,751..1,779] ~ overlap (-0.3%) 2,512 ops/sec [2,456..2,559] → 2,321 ops/sec [2,290..2,339] 🔴 -7.6%
spread pre-wrapped iterator — 20 elements 4,153 ops/sec [4,126..4,254] → 4,181 ops/sec [4,130..4,233] ~ overlap (+0.7%) 5,721 ops/sec [5,653..5,815] → 5,318 ops/sec [5,238..5,405] 🔴 -7.1%
Iterator.from({next}).forEach — 50 elements 1,347 ops/sec [1,339..1,366] → 1,383 ops/sec [1,299..1,437] ~ overlap (+2.7%) 2,014 ops/sec [1,965..2,021] → 1,782 ops/sec [1,771..1,800] 🔴 -11.5%
Iterator.from({next}).reduce — 50 elements 1,355 ops/sec [1,320..1,393] → 1,339 ops/sec [1,327..1,434] ~ overlap (-1.2%) 1,980 ops/sec [1,937..2,046] → 1,799 ops/sec [1,793..1,810] 🔴 -9.2%
wrap array iterator 74,656 ops/sec [72,599..75,624] → 72,620 ops/sec [70,967..73,390] ~ overlap (-2.7%) 84,815 ops/sec [83,692..87,880] → 75,088 ops/sec [73,995..75,189] 🔴 -11.5%
wrap plain {next()} object 2,929 ops/sec [2,897..2,970] → 2,905 ops/sec [2,890..3,052] ~ overlap (-0.8%) 4,155 ops/sec [4,123..4,187] → 3,796 ops/sec [3,772..3,847] 🔴 -8.6%
map + toArray (50 elements) 1,366 ops/sec [1,351..1,389] → 1,403 ops/sec [1,332..1,414] ~ overlap (+2.7%) 2,038 ops/sec [1,985..2,119] → 1,808 ops/sec [1,799..1,821] 🔴 -11.3%
filter + toArray (50 elements) 1,368 ops/sec [1,359..1,382] → 1,347 ops/sec [1,332..1,444] ~ overlap (-1.6%) 1,982 ops/sec [1,938..2,002] → 1,803 ops/sec [1,791..1,815] 🔴 -9.0%
take(10) + toArray (50 element source) 7,947 ops/sec [7,911..8,027] → 8,558 ops/sec [8,415..8,607] 🟢 +7.7% 11,339 ops/sec [11,276..11,554] → 10,206 ops/sec [10,138..10,288] 🔴 -10.0%
drop(40) + toArray (50 element source) 1,806 ops/sec [1,790..1,824] → 1,866 ops/sec [1,859..1,876] 🟢 +3.3% 2,624 ops/sec [2,594..2,639] → 2,307 ops/sec [2,302..2,314] 🔴 -12.1%
chained map + filter + take (100 element source) 2,627 ops/sec [2,614..2,658] → 2,748 ops/sec [2,543..2,778] ~ overlap (+4.6%) 3,816 ops/sec [3,806..3,836] → 3,414 ops/sec [3,374..3,426] 🔴 -10.5%
some + every (50 elements) 757 ops/sec [748..763] → 751 ops/sec [749..755] ~ overlap (-0.8%) 1,128 ops/sec [1,124..1,141] → 1,034 ops/sec [1,023..1,046] 🔴 -8.3%
find (50 elements) 1,654 ops/sec [1,633..1,666] → 1,661 ops/sec [1,641..1,676] ~ overlap (+0.5%) 2,504 ops/sec [2,485..2,538] → 2,233 ops/sec [2,200..2,254] 🔴 -10.8%
concat 2 arrays (10 + 10 elements) 69,115 ops/sec [68,255..71,077] → 68,657 ops/sec [67,641..69,669] ~ overlap (-0.7%) 78,799 ops/sec [72,734..79,320] → 68,806 ops/sec [68,179..69,737] 🔴 -12.7%
concat 5 arrays (10 elements each) 40,918 ops/sec [40,119..42,881] → 40,183 ops/sec [39,525..40,597] ~ overlap (-1.8%) 46,522 ops/sec [45,907..46,899] → 41,321 ops/sec [40,552..42,092] 🔴 -11.2%
concat 2 arrays (20 + 20 elements) 59,759 ops/sec [58,613..61,092] → 58,497 ops/sec [57,893..58,545] 🔴 -2.1% 65,482 ops/sec [65,029..66,611] → 57,780 ops/sec [56,575..58,337] 🔴 -11.8%
concat + filter + toArray (20 + 20 elements) 6,012 ops/sec [5,944..6,177] → 5,954 ops/sec [5,901..6,007] ~ overlap (-1.0%) 9,757 ops/sec [9,634..9,798] → 8,279 ops/sec [8,196..8,351] 🔴 -15.2%
concat + map + take (20 + 20 elements, take 10) 18,234 ops/sec [18,123..18,696] → 18,858 ops/sec [18,587..18,961] ~ overlap (+3.4%) 27,066 ops/sec [26,894..27,228] → 23,400 ops/sec [23,291..23,519] 🔴 -13.5%
concat Sets (15 + 15 elements) 67,550 ops/sec [66,166..68,801] → 66,051 ops/sec [63,908..66,514] ~ overlap (-2.2%) 73,747 ops/sec [72,661..74,870] → 63,550 ops/sec [62,893..64,564] 🔴 -13.8%
concat strings (13 + 13 characters) 45,635 ops/sec [44,729..46,304] → 44,476 ops/sec [44,237..45,233] ~ overlap (-2.5%) 49,770 ops/sec [49,421..50,095] → 45,212 ops/sec [44,866..45,563] 🔴 -9.2%
zip 2 arrays (10 + 10 elements) 28,507 ops/sec [27,725..28,955] → 28,006 ops/sec [27,743..28,427] ~ overlap (-1.8%) 30,665 ops/sec [30,235..31,792] → 27,503 ops/sec [27,218..27,801] 🔴 -10.3%
zip 3 arrays (10 elements each) 25,238 ops/sec [25,125..26,125] → 25,459 ops/sec [25,372..25,615] ~ overlap (+0.9%) 28,478 ops/sec [27,978..28,940] → 25,188 ops/sec [24,730..25,414] 🔴 -11.5%
zip 2 arrays (20 + 20 elements) 18,697 ops/sec [18,318..19,240] → 18,536 ops/sec [18,251..18,633] ~ overlap (-0.9%) 20,447 ops/sec [20,251..20,696] → 18,355 ops/sec [18,045..18,677] 🔴 -10.2%
zip 2 arrays (50 + 50 elements) 9,149 ops/sec [9,111..9,173] → 9,354 ops/sec [9,271..9,424] 🟢 +2.2% 10,182 ops/sec [10,068..10,338] → 9,282 ops/sec [9,132..9,344] 🔴 -8.8%
zip shortest mode (20 + 10 elements) 27,734 ops/sec [27,347..28,539] → 27,936 ops/sec [27,713..28,377] ~ overlap (+0.7%) 30,260 ops/sec [29,670..30,342] → 28,837 ops/sec [28,682..29,070] 🔴 -4.7%
zip longest mode (10 + 20 elements) 16,383 ops/sec [16,006..16,745] → 16,519 ops/sec [16,266..16,641] ~ overlap (+0.8%) 17,267 ops/sec [16,245..17,927] → 15,613 ops/sec [15,347..16,058] 🔴 -9.6%
zip strict mode (20 + 20 elements) 17,727 ops/sec [17,469..18,084] → 18,102 ops/sec [17,916..18,159] ~ overlap (+2.1%) 19,962 ops/sec [19,626..20,072] → 18,323 ops/sec [18,134..18,459] 🔴 -8.2%
zip + map + toArray (20 + 20 elements) 7,402 ops/sec [7,340..7,568] → 7,372 ops/sec [7,298..7,407] ~ overlap (-0.4%) 5,801 ops/sec [5,732..5,890] → 5,271 ops/sec [5,211..5,380] 🔴 -9.1%
zip + filter + toArray (20 + 20 elements) 7,334 ops/sec [7,232..7,388] → 7,289 ops/sec [7,202..7,321] ~ overlap (-0.6%) 6,102 ops/sec [5,851..6,224] → 5,611 ops/sec [5,482..5,675] 🔴 -8.0%
zip Sets (15 + 15 elements) 22,591 ops/sec [22,412..23,248] → 23,121 ops/sec [22,742..23,459] ~ overlap (+2.3%) 26,396 ops/sec [24,627..27,051] → 23,497 ops/sec [20,862..23,659] 🔴 -11.0%
zipKeyed 2 keys (10 elements each) 25,687 ops/sec [25,116..26,377] → 25,610 ops/sec [25,162..26,073] ~ overlap (-0.3%) 29,238 ops/sec [29,077..29,425] → 26,974 ops/sec [26,609..27,289] 🔴 -7.7%
zipKeyed 3 keys (20 elements each) 12,758 ops/sec [12,559..13,049] → 12,343 ops/sec [12,283..12,494] 🔴 -3.2% 14,439 ops/sec [14,274..14,691] → 12,034 ops/sec [11,861..13,029] 🔴 -16.7%
zipKeyed longest mode (10 + 20 elements) 14,524 ops/sec [14,159..14,723] → 14,431 ops/sec [14,088..14,548] ~ overlap (-0.6%) 16,363 ops/sec [16,211..16,525] → 13,765 ops/sec [13,675..13,975] 🔴 -15.9%
zipKeyed strict mode (20 + 20 elements) 15,185 ops/sec [14,848..15,523] → 15,179 ops/sec [14,993..15,403] ~ overlap (-0.0%) 17,180 ops/sec [16,280..17,364] → 14,538 ops/sec [14,352..14,641] 🔴 -15.4%
zipKeyed + filter + map (20 elements) 5,077 ops/sec [5,025..5,099] → 5,067 ops/sec [5,030..5,123] ~ overlap (-0.2%) 6,630 ops/sec [6,482..6,757] → 5,875 ops/sec [5,824..6,021] 🔴 -11.4%
array.values().map().filter().toArray() 2,699 ops/sec [2,658..2,723] → 2,680 ops/sec [2,674..2,691] ~ overlap (-0.7%) 4,424 ops/sec [4,379..4,525] → 3,874 ops/sec [3,820..3,964] 🔴 -12.4%
array.values().take(5).toArray() 94,515 ops/sec [93,897..98,514] → 96,529 ops/sec [95,848..96,974] ~ overlap (+2.1%) 109,316 ops/sec [107,466..110,719] → 96,276 ops/sec [95,728..97,976] 🔴 -11.9%
array.values().drop(45).toArray() 79,187 ops/sec [77,444..80,239] → 78,567 ops/sec [76,709..79,928] ~ overlap (-0.8%) 88,460 ops/sec [87,141..89,094] → 77,982 ops/sec [76,300..79,275] 🔴 -11.8%
map.entries() chained helpers 3,941 ops/sec [3,896..3,991] → 4,014 ops/sec [3,964..4,099] ~ overlap (+1.8%) 2,942 ops/sec [2,910..3,011] → 2,725 ops/sec [2,703..2,782] 🔴 -7.4%
set.values() chained helpers 6,125 ops/sec [6,075..6,190] → 6,339 ops/sec [6,264..6,478] 🟢 +3.5% 9,780 ops/sec [9,466..10,122] → 8,662 ops/sec [8,484..8,790] 🔴 -11.4%
string iterator map + toArray 5,302 ops/sec [5,245..5,412] → 5,365 ops/sec [5,281..5,594] ~ overlap (+1.2%) 6,053 ops/sec [5,825..6,108] → 5,418 ops/sec [5,317..5,525] 🔴 -10.5%
json.js — Interp: 🔴 18, 2 unch. · avg -6.4% · Bytecode: 🔴 20 · avg -9.9%
Benchmark Interpreted Δ Bytecode Δ
parse simple object 73,594 ops/sec [72,725..74,214] → 67,599 ops/sec [66,031..68,856] 🔴 -8.1% 76,825 ops/sec [76,662..77,107] → 68,563 ops/sec [67,645..68,854] 🔴 -10.8%
parse nested object 51,008 ops/sec [50,897..51,322] → 45,011 ops/sec [44,219..46,600] 🔴 -11.8% 49,257 ops/sec [48,457..49,673] → 45,506 ops/sec [44,813..46,232] 🔴 -7.6%
parse array of objects 30,809 ops/sec [30,421..31,108] → 27,645 ops/sec [27,473..28,001] 🔴 -10.3% 29,371 ops/sec [28,966..29,446] → 27,094 ops/sec [26,837..27,337] 🔴 -7.8%
parse large flat object 31,526 ops/sec [31,245..31,699] → 29,154 ops/sec [28,626..29,579] 🔴 -7.5% 31,766 ops/sec [31,500..32,237] → 28,736 ops/sec [28,403..29,164] 🔴 -9.5%
parse mixed types 36,969 ops/sec [36,626..37,220] → 34,428 ops/sec [34,180..34,617] 🔴 -6.9% 37,682 ops/sec [37,599..37,962] → 34,141 ops/sec [33,953..34,564] 🔴 -9.4%
stringify simple object 79,669 ops/sec [78,662..82,556] → 75,175 ops/sec [74,679..76,148] 🔴 -5.6% 70,392 ops/sec [69,441..70,728] → 62,856 ops/sec [62,505..63,163] 🔴 -10.7%
stringify nested object 48,261 ops/sec [48,049..48,393] → 43,057 ops/sec [42,288..43,984] 🔴 -10.8% 39,340 ops/sec [38,496..39,689] → 35,702 ops/sec [34,860..36,098] 🔴 -9.2%
stringify array of objects 21,447 ops/sec [21,233..22,447] → 19,432 ops/sec [19,394..19,665] 🔴 -9.4% 21,135 ops/sec [20,666..21,524] → 18,392 ops/sec [18,258..18,532] 🔴 -13.0%
stringify mixed types 31,356 ops/sec [31,132..31,458] → 29,032 ops/sec [28,635..29,189] 🔴 -7.4% 27,136 ops/sec [26,950..27,434] → 24,055 ops/sec [24,031..24,087] 🔴 -11.4%
reviver doubles numbers 14,786 ops/sec [14,725..15,105] → 14,154 ops/sec [14,143..14,223] 🔴 -4.3% 18,416 ops/sec [17,743..18,511] → 16,760 ops/sec [16,606..16,955] 🔴 -9.0%
reviver filters properties 14,883 ops/sec [14,818..14,963] → 13,489 ops/sec [13,320..13,723] 🔴 -9.4% 15,614 ops/sec [15,437..15,866] → 14,404 ops/sec [14,027..14,593] 🔴 -7.7%
reviver on nested object 18,566 ops/sec [18,145..18,807] → 16,742 ops/sec [16,492..16,902] 🔴 -9.8% 19,897 ops/sec [19,730..20,149] → 18,181 ops/sec [17,978..18,354] 🔴 -8.6%
reviver on array 9,012 ops/sec [8,935..9,167] → 8,827 ops/sec [8,753..8,920] 🔴 -2.0% 11,365 ops/sec [11,161..11,418] → 10,173 ops/sec [10,135..10,277] 🔴 -10.5%
replacer function doubles numbers 16,437 ops/sec [16,208..16,807] → 16,322 ops/sec [16,218..16,629] ~ overlap (-0.7%) 20,533 ops/sec [20,502..20,796] → 18,474 ops/sec [18,258..18,725] 🔴 -10.0%
replacer function excludes properties 22,411 ops/sec [22,105..22,607] → 21,870 ops/sec [21,475..22,041] 🔴 -2.4% 25,892 ops/sec [25,369..26,387] → 23,252 ops/sec [23,148..23,347] 🔴 -10.2%
array replacer (allowlist) 47,440 ops/sec [47,177..49,475] → 45,388 ops/sec [45,358..46,726] 🔴 -4.3% 42,051 ops/sec [41,248..42,371] → 38,530 ops/sec [38,094..39,047] 🔴 -8.4%
stringify with 2-space indent 40,894 ops/sec [40,022..41,827] → 39,722 ops/sec [38,678..40,413] ~ overlap (-2.9%) 37,900 ops/sec [37,555..38,360] → 35,039 ops/sec [34,810..35,264] 🔴 -7.5%
stringify with tab indent 40,850 ops/sec [40,005..41,326] → 39,590 ops/sec [39,331..39,987] 🔴 -3.1% 37,953 ops/sec [37,615..38,179] → 34,191 ops/sec [33,753..34,254] 🔴 -9.9%
parse then stringify 25,084 ops/sec [24,468..25,837] → 23,527 ops/sec [23,424..23,542] 🔴 -6.2% 26,136 ops/sec [25,733..26,757] → 22,848 ops/sec [22,757..22,936] 🔴 -12.6%
stringify then parse 15,026 ops/sec [14,482..15,521] → 14,193 ops/sec [13,781..14,302] 🔴 -5.5% 15,561 ops/sec [14,622..15,817] → 13,393 ops/sec [13,199..13,462] 🔴 -13.9%
jsx.jsx — Interp: 🟢 2, 🔴 8, 11 unch. · avg -1.2% · Bytecode: 🔴 21 · avg -11.5%
Benchmark Interpreted Δ Bytecode Δ
simple element 94,313 ops/sec [91,614..94,493] → 90,316 ops/sec [88,050..91,054] 🔴 -4.2% 113,216 ops/sec [110,946..115,677] → 97,592 ops/sec [97,477..97,860] 🔴 -13.8%
self-closing element 95,031 ops/sec [94,117..97,534] → 91,716 ops/sec [90,718..92,146] 🔴 -3.5% 121,531 ops/sec [119,975..122,444] → 104,048 ops/sec [103,485..104,184] 🔴 -14.4%
element with string attribute 80,685 ops/sec [78,419..82,164] → 76,860 ops/sec [76,493..77,956] 🔴 -4.7% 89,098 ops/sec [86,600..91,321] → 80,324 ops/sec [79,371..82,013] 🔴 -9.8%
element with multiple attributes 69,032 ops/sec [67,826..69,765] → 65,135 ops/sec [63,453..66,362] 🔴 -5.6% 65,016 ops/sec [64,254..65,160] → 57,544 ops/sec [55,642..58,068] 🔴 -11.5%
element with expression attribute 73,768 ops/sec [73,166..74,274] → 71,360 ops/sec [70,965..71,953] 🔴 -3.3% 92,876 ops/sec [90,510..94,567] → 79,175 ops/sec [78,108..79,526] 🔴 -14.8%
text child 93,995 ops/sec [93,365..94,192] → 90,418 ops/sec [89,711..92,429] 🔴 -3.8% 111,707 ops/sec [108,330..115,446] → 98,335 ops/sec [97,332..99,980] 🔴 -12.0%
expression child 90,004 ops/sec [89,119..90,846] → 88,054 ops/sec [86,329..90,662] ~ overlap (-2.2%) 107,715 ops/sec [104,174..108,241] → 94,353 ops/sec [93,269..94,814] 🔴 -12.4%
mixed text and expression 86,447 ops/sec [85,959..86,680] → 84,349 ops/sec [83,635..85,725] 🔴 -2.4% 98,250 ops/sec [89,495..100,265] → 85,094 ops/sec [84,787..85,714] 🔴 -13.4%
nested elements (3 levels) 35,689 ops/sec [34,971..36,065] → 35,290 ops/sec [34,929..35,921] ~ overlap (-1.1%) 42,879 ops/sec [41,487..43,779] → 36,942 ops/sec [36,731..37,361] 🔴 -13.8%
sibling children 26,283 ops/sec [25,885..26,858] → 26,323 ops/sec [25,556..26,490] ~ overlap (+0.2%) 31,122 ops/sec [30,430..31,818] → 27,484 ops/sec [27,187..27,869] 🔴 -11.7%
component element 68,714 ops/sec [67,854..69,230] → 68,769 ops/sec [66,904..68,930] ~ overlap (+0.1%) 83,787 ops/sec [82,121..85,610] → 76,178 ops/sec [74,948..76,456] 🔴 -9.1%
component with children 42,208 ops/sec [41,269..43,041] → 41,784 ops/sec [41,132..42,697] ~ overlap (-1.0%) 49,672 ops/sec [48,915..50,653] → 44,844 ops/sec [44,137..45,353] 🔴 -9.7%
dotted component 57,938 ops/sec [57,507..58,670] → 58,937 ops/sec [58,267..61,302] ~ overlap (+1.7%) 66,620 ops/sec [65,166..67,533] → 59,966 ops/sec [59,430..60,896] 🔴 -10.0%
empty fragment 93,443 ops/sec [92,816..94,076] → 94,816 ops/sec [93,362..95,931] ~ overlap (+1.5%) 130,815 ops/sec [128,320..132,969] → 111,542 ops/sec [110,191..113,810] 🔴 -14.7%
fragment with children 26,640 ops/sec [25,958..28,046] → 26,615 ops/sec [26,456..27,133] ~ overlap (-0.1%) 31,627 ops/sec [30,923..31,902] → 27,788 ops/sec [27,352..27,901] 🔴 -12.1%
spread attributes 50,327 ops/sec [49,511..51,373] → 49,313 ops/sec [48,752..49,919] ~ overlap (-2.0%) 49,745 ops/sec [48,786..50,177] → 44,681 ops/sec [44,233..44,801] 🔴 -10.2%
spread with overrides 45,342 ops/sec [44,772..46,597] → 43,787 ops/sec [43,301..43,887] 🔴 -3.4% 43,728 ops/sec [42,621..44,526] → 39,837 ops/sec [38,626..40,314] 🔴 -8.9%
shorthand props 71,839 ops/sec [69,084..73,372] → 71,663 ops/sec [69,835..71,994] ~ overlap (-0.2%) 75,868 ops/sec [73,390..77,103] → 68,718 ops/sec [67,378..69,905] 🔴 -9.4%
nav bar structure 12,672 ops/sec [12,490..12,813] → 13,022 ops/sec [12,728..13,081] ~ overlap (+2.8%) 14,519 ops/sec [14,377..14,597] → 12,834 ops/sec [12,630..13,163] 🔴 -11.6%
card component tree 14,989 ops/sec [14,667..15,166] → 15,306 ops/sec [15,169..15,839] 🟢 +2.1% 16,367 ops/sec [15,877..16,585] → 14,313 ops/sec [14,024..14,641] 🔴 -12.6%
10 list items via Array.from 6,521 ops/sec [6,451..6,647] → 6,862 ops/sec [6,747..7,008] 🟢 +5.2% 6,826 ops/sec [6,713..6,934] → 6,389 ops/sec [6,323..6,411] 🔴 -6.4%
modules.js — Interp: 🔴 6, 3 unch. · avg -3.3% · Bytecode: 🔴 9 · avg -13.0%
Benchmark Interpreted Δ Bytecode Δ
call imported function 163,067 ops/sec [160,577..167,449] → 159,842 ops/sec [159,261..160,335] 🔴 -2.0% 604,145 ops/sec [601,215..604,869] → 556,091 ops/sec [554,479..561,740] 🔴 -8.0%
call two imported functions 93,254 ops/sec [92,319..93,966] → 91,120 ops/sec [89,294..93,494] ~ overlap (-2.3%) 391,054 ops/sec [389,601..391,524] → 361,675 ops/sec [358,251..362,955] 🔴 -7.5%
read imported constant 517,958 ops/sec [515,325..519,279] → 487,428 ops/sec [478,442..493,626] 🔴 -5.9% 1,498,525 ops/sec [1,475,096..1,520,642] → 1,274,270 ops/sec [1,244,836..1,331,570] 🔴 -15.0%
read imported string 503,355 ops/sec [496,789..509,883] → 479,800 ops/sec [469,261..493,776] 🔴 -4.7% 1,493,004 ops/sec [1,465,487..1,515,989] → 1,251,084 ops/sec [1,240,192..1,253,038] 🔴 -16.2%
read JSON string property 501,725 ops/sec [488,355..514,135] → 490,369 ops/sec [479,015..491,187] ~ overlap (-2.3%) 1,467,224 ops/sec [1,463,974..1,471,287] → 1,270,676 ops/sec [1,245,210..1,278,631] 🔴 -13.4%
read JSON number property 487,991 ops/sec [481,959..512,399] → 480,868 ops/sec [478,116..486,113] ~ overlap (-1.5%) 1,466,594 ops/sec [1,454,695..1,485,905] → 1,272,009 ops/sec [1,269,648..1,289,357] 🔴 -13.3%
read JSON boolean property 499,793 ops/sec [487,668..517,487] → 477,335 ops/sec [475,822..478,338] 🔴 -4.5% 1,498,128 ops/sec [1,404,172..1,564,091] → 1,267,721 ops/sec [1,265,074..1,277,221] 🔴 -15.4%
read JSON array property 501,185 ops/sec [494,818..502,723] → 485,895 ops/sec [481,998..494,062] 🔴 -3.1% 1,489,595 ops/sec [1,489,208..1,505,487] → 1,261,975 ops/sec [1,256,001..1,343,111] 🔴 -15.3%
read multiple JSON properties 302,566 ops/sec [295,605..316,836] → 292,645 ops/sec [288,796..295,502] 🔴 -3.3% 1,285,529 ops/sec [1,261,202..1,306,056] → 1,117,121 ops/sec [1,098,747..1,142,898] 🔴 -13.1%
numbers.js — Interp: 🔴 5, 6 unch. · avg -2.5% · Bytecode: 🔴 11 · avg -9.4%
Benchmark Interpreted Δ Bytecode Δ
integer arithmetic 161,777 ops/sec [159,840..163,970] → 157,467 ops/sec [156,789..159,246] 🔴 -2.7% 702,676 ops/sec [695,016..711,810] → 646,977 ops/sec [644,771..649,164] 🔴 -7.9%
floating point arithmetic 190,123 ops/sec [189,100..190,797] → 184,137 ops/sec [179,536..188,057] 🔴 -3.1% 310,256 ops/sec [304,120..312,903] → 285,600 ops/sec [284,347..291,253] 🔴 -7.9%
number coercion 75,677 ops/sec [74,803..76,155] → 75,123 ops/sec [74,259..76,082] ~ overlap (-0.7%) 98,848 ops/sec [96,232..101,142] → 89,283 ops/sec [89,139..89,460] 🔴 -9.7%
toFixed 43,875 ops/sec [43,752..44,462] → 43,486 ops/sec [42,611..43,999] ~ overlap (-0.9%) 43,545 ops/sec [42,912..44,197] → 40,083 ops/sec [39,836..40,161] 🔴 -8.0%
toString 66,479 ops/sec [65,961..67,489] → 66,384 ops/sec [66,113..67,159] ~ overlap (-0.1%) 74,745 ops/sec [74,087..75,126] → 68,286 ops/sec [67,900..70,376] 🔴 -8.6%
valueOf 100,203 ops/sec [97,286..104,588] → 98,368 ops/sec [94,560..99,388] ~ overlap (-1.8%) 114,208 ops/sec [112,462..115,034] → 105,704 ops/sec [105,310..105,852] 🔴 -7.4%
toPrecision 38,431 ops/sec [36,800..39,059] → 37,058 ops/sec [36,341..37,502] ~ overlap (-3.6%) 38,789 ops/sec [38,596..39,049] → 35,555 ops/sec [35,219..35,637] 🔴 -8.3%
Number.isNaN 121,953 ops/sec [120,555..122,566] → 116,341 ops/sec [113,119..119,479] 🔴 -4.6% 126,748 ops/sec [124,581..132,082] → 113,845 ops/sec [110,203..114,839] 🔴 -10.2%
Number.isFinite 118,991 ops/sec [118,487..122,815] → 116,369 ops/sec [113,563..117,675] 🔴 -2.2% 111,720 ops/sec [108,498..113,338] → 98,472 ops/sec [95,558..101,111] 🔴 -11.9%
Number.isInteger 124,704 ops/sec [120,281..127,359] → 120,753 ops/sec [119,198..121,500] ~ overlap (-3.2%) 117,390 ops/sec [109,177..120,014] → 103,702 ops/sec [102,899..105,130] 🔴 -11.7%
Number.parseInt and parseFloat 99,610 ops/sec [98,632..100,389] → 95,008 ops/sec [92,119..96,734] 🔴 -4.6% 88,821 ops/sec [86,002..90,277] → 78,796 ops/sec [76,774..80,296] 🔴 -11.3%
objects.js — Interp: 🟢 1, 🔴 2, 4 unch. · avg -1.5% · Bytecode: 🔴 7 · avg -8.9%
Benchmark Interpreted Δ Bytecode Δ
create simple object 190,991 ops/sec [190,512..195,654] → 191,153 ops/sec [189,408..192,668] ~ overlap (+0.1%) 166,459 ops/sec [164,026..169,250] → 157,944 ops/sec [156,389..158,851] 🔴 -5.1%
create nested object 98,519 ops/sec [98,015..99,585] → 100,297 ops/sec [99,755..100,442] 🟢 +1.8% 73,705 ops/sec [73,040..75,787] → 69,680 ops/sec [68,613..70,105] 🔴 -5.5%
create 50 objects via Array.from 3,806 ops/sec [3,761..3,856] → 3,941 ops/sec [3,775..3,991] ~ overlap (+3.5%) 3,422 ops/sec [3,352..3,492] → 3,186 ops/sec [3,106..3,230] 🔴 -6.9%
property read 201,102 ops/sec [197,777..202,255] → 189,832 ops/sec [188,597..190,632] 🔴 -5.6% 311,826 ops/sec [307,878..312,673] → 263,836 ops/sec [262,954..264,977] 🔴 -15.4%
Object.keys 131,172 ops/sec [129,739..131,698] → 119,543 ops/sec [119,029..123,946] 🔴 -8.9% 144,704 ops/sec [142,116..145,742] → 130,191 ops/sec [127,894..131,411] 🔴 -10.0%
Object.entries 51,904 ops/sec [50,847..54,796] → 51,693 ops/sec [50,494..52,332] ~ overlap (-0.4%) 55,442 ops/sec [54,707..55,636] → 49,876 ops/sec [49,622..49,972] 🔴 -10.0%
spread operator 81,199 ops/sec [80,026..83,398] → 80,328 ops/sec [79,426..81,685] ~ overlap (-1.1%) 78,041 ops/sec [77,696..78,748] → 70,497 ops/sec [69,616..70,557] 🔴 -9.7%
promises.js — Interp: 🟢 1, 11 unch. · avg +0.1% · Bytecode: 🔴 11, 1 unch. · avg -7.6%
Benchmark Interpreted Δ Bytecode Δ
Promise.resolve(value) 210,803 ops/sec [205,784..212,534] → 211,153 ops/sec [205,208..211,560] ~ overlap (+0.2%) 221,605 ops/sec [204,586..226,062] → 205,524 ops/sec [202,215..215,537] ~ overlap (-7.3%)
new Promise(resolve => resolve(value)) 80,581 ops/sec [79,396..83,202] → 79,852 ops/sec [78,172..80,397] ~ overlap (-0.9%) 107,635 ops/sec [103,772..108,743] → 99,726 ops/sec [99,510..99,828] 🔴 -7.3%
Promise.reject(reason) 216,630 ops/sec [211,110..218,610] → 209,644 ops/sec [208,046..212,020] ~ overlap (-3.2%) 238,363 ops/sec [235,360..239,106] → 211,601 ops/sec [209,686..211,889] 🔴 -11.2%
resolve + then (1 handler) 76,836 ops/sec [76,190..77,278] → 78,622 ops/sec [78,265..79,481] 🟢 +2.3% 97,855 ops/sec [97,001..98,706] → 87,184 ops/sec [85,700..89,934] 🔴 -10.9%
resolve + then chain (3 deep) 32,032 ops/sec [31,761..32,563] → 33,021 ops/sec [32,558..33,941] ~ overlap (+3.1%) 40,443 ops/sec [39,738..41,039] → 36,798 ops/sec [36,250..37,582] 🔴 -9.0%
resolve + then chain (10 deep) 10,622 ops/sec [10,598..10,685] → 10,779 ops/sec [10,460..10,969] ~ overlap (+1.5%) 13,505 ops/sec [13,337..13,586] → 12,874 ops/sec [12,308..12,946] 🔴 -4.7%
reject + catch + then 46,808 ops/sec [45,557..47,560] → 46,612 ops/sec [45,858..47,326] ~ overlap (-0.4%) 54,163 ops/sec [53,667..55,068] → 52,420 ops/sec [52,264..52,659] 🔴 -3.2%
resolve + finally + then 41,181 ops/sec [40,868..41,567] → 41,338 ops/sec [40,637..41,844] ~ overlap (+0.4%) 45,289 ops/sec [44,777..45,588] → 42,118 ops/sec [41,941..43,070] 🔴 -7.0%
Promise.all (5 resolved) 17,048 ops/sec [16,337..17,727] → 16,700 ops/sec [16,436..16,898] ~ overlap (-2.0%) 16,237 ops/sec [15,718..16,441] → 15,309 ops/sec [14,713..15,431] 🔴 -5.7%
Promise.race (5 resolved) 17,715 ops/sec [17,414..18,334] → 17,825 ops/sec [17,647..18,085] ~ overlap (+0.6%) 17,504 ops/sec [17,303..17,545] → 15,873 ops/sec [15,838..15,905] 🔴 -9.3%
Promise.allSettled (5 mixed) 14,073 ops/sec [13,634..14,810] → 14,174 ops/sec [13,932..14,391] ~ overlap (+0.7%) 13,828 ops/sec [13,650..13,955] → 12,703 ops/sec [12,556..12,791] 🔴 -8.1%
Promise.any (5 mixed) 16,987 ops/sec [15,616..17,329] → 16,785 ops/sec [16,710..16,832] ~ overlap (-1.2%) 16,459 ops/sec [16,239..16,868] → 15,196 ops/sec [15,149..15,247] 🔴 -7.7%
regexp.js — Interp: 🟢 6, 🔴 3, 2 unch. · avg +4.7% · Bytecode: 🟢 6, 🔴 3, 2 unch. · avg +4.8%
Benchmark Interpreted Δ Bytecode Δ
regex literal creation 8,284 ops/sec [7,663..8,316] → 7,539 ops/sec [7,351..7,579] 🔴 -9.0% 7,757 ops/sec [7,510..8,332] → 8,315 ops/sec [8,226..8,432] ~ overlap (+7.2%)
new RegExp(pattern, flags) 7,652 ops/sec [7,551..8,024] → 7,266 ops/sec [6,957..7,413] 🔴 -5.0% 8,206 ops/sec [7,855..8,322] → 8,266 ops/sec [8,224..8,326] ~ overlap (+0.7%)
RegExp(existingRegex) returns the same regex 252,594 ops/sec [252,268..255,271] → 246,399 ops/sec [242,265..253,524] ~ overlap (-2.5%) 370,457 ops/sec [358,387..371,556] → 336,116 ops/sec [332,446..343,817] 🔴 -9.3%
test() on a global regex 42,955 ops/sec [42,272..43,377] → 41,001 ops/sec [40,597..41,197] 🔴 -4.5% 44,685 ops/sec [43,974..45,882] → 41,868 ops/sec [40,274..42,931] 🔴 -6.3%
exec() with capture groups 14,549 ops/sec [14,425..14,592] → 16,291 ops/sec [16,160..16,346] 🟢 +12.0% 14,525 ops/sec [14,028..15,146] → 16,015 ops/sec [15,798..16,157] 🟢 +10.3%
toString() 202,066 ops/sec [199,788..206,261] → 206,930 ops/sec [204,890..208,858] ~ overlap (+2.4%) 240,868 ops/sec [235,928..246,139] → 225,565 ops/sec [218,199..233,103] 🔴 -6.4%
match() with global regex 1,550 ops/sec [1,537..1,564] → 1,751 ops/sec [1,735..1,760] 🟢 +12.9% 1,490 ops/sec [1,475..1,541] → 1,686 ops/sec [1,659..1,733] 🟢 +13.2%
matchAll() with capture groups 3,651 ops/sec [3,639..3,664] → 3,894 ops/sec [3,845..3,914] 🟢 +6.7% 3,776 ops/sec [3,759..3,855] → 4,012 ops/sec [3,955..4,158] 🟢 +6.3%
replace() with global regex 1,532 ops/sec [1,478..1,545] → 1,719 ops/sec [1,688..1,740] 🟢 +12.2% 1,483 ops/sec [1,464..1,500] → 1,661 ops/sec [1,628..1,696] 🟢 +12.0%
search() with regex 1,656 ops/sec [1,645..1,662] → 1,913 ops/sec [1,900..1,920] 🟢 +15.5% 1,611 ops/sec [1,546..1,679] → 1,853 ops/sec [1,785..1,859] 🟢 +15.1%
split() with regex separator 1,277 ops/sec [1,239..1,291] → 1,425 ops/sec [1,414..1,440] 🟢 +11.6% 1,235 ops/sec [1,193..1,276] → 1,357 ops/sec [1,334..1,409] 🟢 +9.9%
strings.js — Interp: 🔴 17, 2 unch. · avg -8.4% · Bytecode: 🔴 19 · avg -10.4%
Benchmark Interpreted Δ Bytecode Δ
string concatenation 171,683 ops/sec [156,872..174,707] → 145,507 ops/sec [144,812..146,662] 🔴 -15.2% 881,013 ops/sec [871,304..884,414] → 781,205 ops/sec [765,453..806,165] 🔴 -11.3%
template literal 332,164 ops/sec [303,171..333,416] → 277,588 ops/sec [276,315..281,839] 🔴 -16.4% 611,161 ops/sec [604,314..629,766] → 562,033 ops/sec [558,390..565,021] 🔴 -8.0%
string repeat 195,241 ops/sec [180,631..197,062] → 173,748 ops/sec [170,929..179,337] 🔴 -11.0% 208,484 ops/sec [203,926..210,703] → 186,669 ops/sec [185,250..187,176] 🔴 -10.5%
split and join 31,814 ops/sec [31,630..31,867] → 27,418 ops/sec [26,858..28,295] 🔴 -13.8% 31,589 ops/sec [31,201..32,923] → 28,066 ops/sec [27,398..28,876] 🔴 -11.2%
indexOf and includes 60,223 ops/sec [60,083..60,655] → 53,434 ops/sec [52,972..55,554] 🔴 -11.3% 53,759 ops/sec [53,144..54,027] → 47,738 ops/sec [46,681..48,212] 🔴 -11.2%
toUpperCase and toLowerCase 97,586 ops/sec [95,908..98,174] → 88,843 ops/sec [88,376..90,487] 🔴 -9.0% 93,453 ops/sec [91,969..94,300] → 83,280 ops/sec [82,482..83,747] 🔴 -10.9%
slice and substring 57,616 ops/sec [54,109..59,195] → 51,840 ops/sec [51,450..52,502] 🔴 -10.0% 59,401 ops/sec [58,750..60,328] → 52,533 ops/sec [51,637..54,275] 🔴 -11.6%
trim operations 81,407 ops/sec [78,403..86,259] → 78,927 ops/sec [78,612..79,751] ~ overlap (-3.0%) 83,844 ops/sec [82,957..86,670] → 75,175 ops/sec [74,697..76,192] 🔴 -10.3%
replace and replaceAll 56,935 ops/sec [56,348..58,892] → 52,395 ops/sec [50,487..53,393] 🔴 -8.0% 55,421 ops/sec [53,710..56,133] → 48,280 ops/sec [47,719..50,091] 🔴 -12.9%
startsWith and endsWith 53,399 ops/sec [52,837..54,462] → 50,631 ops/sec [50,353..51,908] 🔴 -5.2% 48,574 ops/sec [47,887..50,544] → 43,036 ops/sec [41,300..43,974] 🔴 -11.4%
padStart and padEnd 78,784 ops/sec [77,316..80,698] → 74,640 ops/sec [73,227..75,551] 🔴 -5.3% 79,316 ops/sec [78,092..81,389] → 69,491 ops/sec [68,635..70,731] 🔴 -12.4%
identity tag, no substitutions 166,179 ops/sec [163,915..168,433] → 163,172 ops/sec [161,370..165,642] ~ overlap (-1.8%) 511,021 ops/sec [490,625..526,633] → 445,814 ops/sec [437,558..451,310] 🔴 -12.8%
tag with 1 substitution 37,214 ops/sec [36,870..37,429] → 35,163 ops/sec [34,933..35,780] 🔴 -5.5% 50,913 ops/sec [50,609..51,814] → 44,327 ops/sec [43,974..45,807] 🔴 -12.9%
tag with 3 substitutions 19,781 ops/sec [19,598..20,010] → 18,971 ops/sec [18,867..19,121] 🔴 -4.1% 30,239 ops/sec [29,867..30,795] → 26,807 ops/sec [26,679..27,032] 🔴 -11.3%
tag with 6 substitutions 11,808 ops/sec [11,793..11,832] → 11,225 ops/sec [10,906..11,312] 🔴 -4.9% 17,099 ops/sec [16,737..17,195] → 15,807 ops/sec [15,709..16,113] 🔴 -7.6%
String.raw, no substitutions 242,485 ops/sec [241,259..244,592] → 222,245 ops/sec [220,590..224,793] 🔴 -8.3% 235,259 ops/sec [228,676..237,321] → 218,478 ops/sec [214,037..221,971] 🔴 -7.1%
String.raw, 2 substitutions 171,601 ops/sec [171,406..172,087] → 157,574 ops/sec [156,523..158,233] 🔴 -8.2% 148,922 ops/sec [148,071..151,937] → 143,684 ops/sec [142,950..143,878] 🔴 -3.5%
tag accessing .raw array 73,138 ops/sec [72,625..73,300] → 65,982 ops/sec [65,311..66,327] 🔴 -9.8% 88,822 ops/sec [88,113..89,907] → 79,375 ops/sec [78,250..81,024] 🔴 -10.6%
method as tag (this binding) 27,532 ops/sec [27,359..27,772] → 25,277 ops/sec [25,101..25,371] 🔴 -8.2% 40,068 ops/sec [39,411..40,804] → 35,985 ops/sec [35,695..36,250] 🔴 -10.2%
tsv.js — Interp: 🔴 8, 1 unch. · avg -7.7% · Bytecode: 🔴 9 · avg -7.5%
Benchmark Interpreted Δ Bytecode Δ
parse simple 3-column TSV 47,170 ops/sec [46,865..48,091] → 43,406 ops/sec [43,106..44,077] 🔴 -8.0% 48,516 ops/sec [47,981..50,388] → 45,113 ops/sec [44,743..45,662] 🔴 -7.0%
parse 10-row TSV 12,763 ops/sec [12,657..13,141] → 11,492 ops/sec [11,449..11,554] 🔴 -10.0% 12,804 ops/sec [12,750..12,982] → 11,848 ops/sec [11,637..12,209] 🔴 -7.5%
parse 100-row TSV 2,025 ops/sec [1,961..2,030] → 1,910 ops/sec [1,903..1,916] 🔴 -5.7% 2,010 ops/sec [1,974..2,039] → 1,876 ops/sec [1,834..1,920] 🔴 -6.6%
parse TSV with backslash-escaped fields 9,382 ops/sec [9,282..9,494] → 9,070 ops/sec [8,905..9,370] ~ overlap (-3.3%) 9,558 ops/sec [9,437..10,003] → 9,091 ops/sec [8,869..9,304] 🔴 -4.9%
parse without headers (array of arrays) 6,120 ops/sec [6,062..6,192] → 5,874 ops/sec [5,800..6,045] 🔴 -4.0% 6,378 ops/sec [6,216..6,502] → 5,771 ops/sec [5,705..5,860] 🔴 -9.5%
stringify array of objects 43,522 ops/sec [43,482..43,674] → 38,610 ops/sec [37,976..39,127] 🔴 -11.3% 45,029 ops/sec [44,753..45,264] → 40,630 ops/sec [40,148..40,995] 🔴 -9.8%
stringify array of arrays 12,363 ops/sec [12,299..12,433] → 10,838 ops/sec [10,672..10,999] 🔴 -12.3% 12,453 ops/sec [12,368..12,580] → 11,536 ops/sec [11,432..11,556] 🔴 -7.4%
stringify with values needing escaping 34,398 ops/sec [33,772..34,445] → 31,514 ops/sec [31,347..31,757] 🔴 -8.4% 35,327 ops/sec [35,296..35,433] → 32,550 ops/sec [32,387..32,821] 🔴 -7.9%
parse then stringify 7,168 ops/sec [7,139..7,210] → 6,691 ops/sec [6,662..6,775] 🔴 -6.7% 7,367 ops/sec [7,334..7,469] → 6,877 ops/sec [6,800..6,936] 🔴 -6.7%
typed-arrays.js — Interp: 🟢 4, 🔴 11, 7 unch. · avg -14.5% · Bytecode: 🔴 20, 2 unch. · avg -10.2%
Benchmark Interpreted Δ Bytecode Δ
new Int32Array(0) 124,323 ops/sec [122,242..129,104] → 124,852 ops/sec [124,398..125,837] ~ overlap (+0.4%) 145,801 ops/sec [142,336..147,541] → 131,742 ops/sec [129,236..132,875] 🔴 -9.6%
new Int32Array(100) 115,669 ops/sec [113,136..119,267] → 117,211 ops/sec [114,570..119,053] ~ overlap (+1.3%) 134,045 ops/sec [132,954..135,913] → 126,193 ops/sec [123,415..126,711] 🔴 -5.9%
new Int32Array(1000) 86,421 ops/sec [84,158..87,242] → 92,069 ops/sec [90,752..92,906] 🟢 +6.5% 92,422 ops/sec [91,866..94,183] → 91,402 ops/sec [88,290..93,500] ~ overlap (-1.1%)
new Float64Array(100) 115,519 ops/sec [112,895..119,775] → 115,336 ops/sec [115,158..116,580] ~ overlap (-0.2%) 127,066 ops/sec [124,701..128,558] → 119,732 ops/sec [119,323..121,413] 🔴 -5.8%
Int32Array.from([...]) 4,183 ops/sec [4,119..4,272] → 4,082 ops/sec [3,904..4,104] 🔴 -2.4% 4,279 ops/sec [4,211..4,384] → 3,953 ops/sec [3,936..3,980] 🔴 -7.6%
Int32Array.of(1, 2, 3, 4, 5) 125,440 ops/sec [124,088..128,663] → 119,460 ops/sec [117,545..120,567] 🔴 -4.8% 143,272 ops/sec [142,377..143,808] → 132,083 ops/sec [131,550..132,604] 🔴 -7.8%
sequential write 100 elements 1,093 ops/sec [1,088..1,097] → 1,091 ops/sec [1,073..1,113] ~ overlap (-0.2%) 2,675 ops/sec [2,536..2,728] → 2,481 ops/sec [2,437..2,507] 🔴 -7.2%
sequential read 100 elements 1,135 ops/sec [1,123..1,148] → 1,135 ops/sec [1,118..1,149] ~ overlap (-0.0%) 2,648 ops/sec [2,626..2,655] → 2,461 ops/sec [2,407..2,501] 🔴 -7.1%
Float64Array write 100 elements 1,041 ops/sec [1,038..1,060] → 1,019 ops/sec [1,011..1,043] ~ overlap (-2.1%) 2,089 ops/sec [2,080..2,106] → 1,942 ops/sec [1,936..1,962] 🔴 -7.1%
fill(42) 4,740 ops/sec [4,693..4,810] → 6,171 ops/sec [6,142..6,193] 🟢 +30.2% 4,682 ops/sec [4,652..4,744] → 4,217 ops/sec [4,185..4,223] 🔴 -9.9%
slice() 36,962 ops/sec [36,538..37,054] → 48,083 ops/sec [47,869..48,153] 🟢 +30.1% 37,972 ops/sec [37,603..38,500] → 35,935 ops/sec [35,723..35,983] 🔴 -5.4%
map(x => x * 2) 2,545 ops/sec [2,537..2,555] → 2,485 ops/sec [2,468..2,537] 🔴 -2.4% 3,466 ops/sec [3,454..3,481] → 3,184 ops/sec [3,165..3,209] 🔴 -8.1%
filter(x => x > 50) 4,292 ops/sec [2,526..4,328] → 2,871 ops/sec [2,505..4,379] ~ overlap (-33.1%) 3,686 ops/sec [3,636..3,735] → 3,394 ops/sec [3,372..3,403] 🔴 -7.9%
reduce (sum) 4,500 ops/sec [4,476..4,578] → 2,667 ops/sec [2,641..2,677] 🔴 -40.7% 3,570 ops/sec [3,501..3,582] → 3,099 ops/sec [3,060..3,113] 🔴 -13.2%
sort() 33,765 ops/sec [33,518..34,267] → 15,904 ops/sec [15,626..16,351] 🔴 -52.9% 22,309 ops/sec [22,212..22,637] → 21,124 ops/sec [21,116..21,149] 🔴 -5.3%
indexOf() 59,554 ops/sec [58,681..60,302] → 31,568 ops/sec [30,971..31,865] 🔴 -47.0% 37,329 ops/sec [37,141..37,848] → 33,593 ops/sec [32,641..34,831] 🔴 -10.0%
reverse() 62,979 ops/sec [61,970..64,168] → 29,828 ops/sec [29,690..29,851] 🔴 -52.6% 41,770 ops/sec [41,603..42,255] → 38,314 ops/sec [38,165..38,536] 🔴 -8.3%
create view over existing buffer 226,515 ops/sec [222,207..228,029] → 140,149 ops/sec [139,749..141,370] 🔴 -38.1% 165,175 ops/sec [163,424..167,655] → 151,693 ops/sec [149,965..153,833] 🔴 -8.2%
subarray() 256,378 ops/sec [251,768..258,683] → 159,742 ops/sec [158,231..171,839] 🔴 -37.7% 294,663 ops/sec [182,856..297,804] → 168,375 ops/sec [167,156..169,643] 🔴 -42.9%
set() from array 223,153 ops/sec [221,537..226,804] → 123,057 ops/sec [121,305..130,612] 🔴 -44.9% 250,447 ops/sec [249,217..250,746] → 137,159 ops/sec [136,118..140,920] 🔴 -45.2%
for-of loop 3,359 ops/sec [3,340..3,380] → 2,124 ops/sec [2,092..2,132] 🔴 -36.8% 15,195 ops/sec [15,126..15,274] → 14,980 ops/sec [14,883..15,029] 🔴 -1.4%
spread into array 12,066 ops/sec [11,995..12,143] → 12,945 ops/sec [12,844..13,093] 🟢 +7.3% 45,423 ops/sec [45,043..45,775] → 45,723 ops/sec [45,293..45,880] ~ overlap (+0.7%)
uint8array-encoding.js — Interp: 🟢 7, 🔴 10, 1 unch. · avg +14.3% · Bytecode: 🟢 2, 🔴 12, 4 unch. · avg -9.3%
Benchmark Interpreted Δ Bytecode Δ
short (5 bytes) 217,217 ops/sec [216,206..218,936] → 206,080 ops/sec [204,418..208,174] 🔴 -5.1% 284,943 ops/sec [283,415..286,389] → 233,923 ops/sec [230,659..234,735] 🔴 -17.9%
medium (450 bytes) 138,509 ops/sec [137,652..138,953] → 127,575 ops/sec [124,811..129,339] 🔴 -7.9% 160,130 ops/sec [158,846..160,753] → 143,681 ops/sec [142,900..144,427] 🔴 -10.3%
large (4096 bytes) 41,428 ops/sec [40,615..42,191] → 30,852 ops/sec [30,673..31,190] 🔴 -25.5% 34,178 ops/sec [33,971..34,477] → 34,677 ops/sec [34,627..34,774] 🟢 +1.5%
base64url alphabet 145,024 ops/sec [142,294..145,416] → 93,174 ops/sec [90,904..95,399] 🔴 -35.8% 129,460 ops/sec [84,786..151,962] → 91,558 ops/sec [90,778..92,518] ~ overlap (-29.3%)
omitPadding 225,095 ops/sec [223,725..227,194] → 133,306 ops/sec [132,526..134,725] 🔴 -40.8% 239,152 ops/sec [233,259..241,368] → 127,861 ops/sec [127,004..129,890] 🔴 -46.5%
short (8 chars) 246,057 ops/sec [243,469..247,018] → 145,429 ops/sec [144,661..146,295] 🔴 -40.9% 256,886 ops/sec [215,702..271,133] → 153,951 ops/sec [153,724..154,101] 🔴 -40.1%
medium (600 chars) 123,900 ops/sec [121,982..125,290] → 70,715 ops/sec [69,460..115,956] 🔴 -42.9% 130,522 ops/sec [130,160..131,144] → 74,866 ops/sec [73,836..75,021] 🔴 -42.6%
large (5464 chars) 14,080 ops/sec [14,034..14,108] → 22,639 ops/sec [22,067..22,981] 🟢 +60.8% 24,474 ops/sec [23,909..25,342] → 14,256 ops/sec [14,108..14,564] 🔴 -41.7%
short (5 bytes) 227,380 ops/sec [219,456..228,249] → 358,349 ops/sec [210,251..361,004] ~ overlap (+57.6%) 511,679 ops/sec [499,270..521,028] → 255,867 ops/sec [253,846..271,153] 🔴 -50.0%
medium (450 bytes) 117,823 ops/sec [116,883..118,175] → 202,180 ops/sec [201,187..203,625] 🟢 +71.6% 227,584 ops/sec [225,900..228,085] → 140,263 ops/sec [139,498..140,364] 🔴 -38.4%
large (4096 bytes) 24,300 ops/sec [23,395..24,826] → 48,968 ops/sec [48,728..49,106] 🟢 +101.5% 42,072 ops/sec [41,935..42,146] → 44,897 ops/sec [28,183..46,708] ~ overlap (+6.7%)
short (10 chars) 166,485 ops/sec [164,335..169,520] → 255,037 ops/sec [252,478..256,585] 🟢 +53.2% 188,476 ops/sec [182,924..289,712] → 263,221 ops/sec [261,930..263,510] ~ overlap (+39.7%)
medium (900 chars) 108,645 ops/sec [106,948..109,590] → 179,459 ops/sec [177,911..179,797] 🟢 +65.2% 116,662 ops/sec [115,377..118,530] → 181,749 ops/sec [179,037..182,281] 🟢 +55.8%
large (8192 chars) 27,995 ops/sec [26,338..28,543] → 51,247 ops/sec [50,651..51,358] 🟢 +83.1% 29,887 ops/sec [28,505..49,831] → 50,052 ops/sec [49,279..51,149] ~ overlap (+67.5%)
setFromBase64 (450 bytes) 66,431 ops/sec [65,352..66,552] → 62,409 ops/sec [61,951..62,453] 🔴 -6.1% 117,091 ops/sec [116,346..118,198] → 107,632 ops/sec [107,188..108,220] 🔴 -8.1%
setFromHex (450 bytes) 25,745 ops/sec [25,232..26,853] → 18,640 ops/sec [18,606..18,859] 🔴 -27.6% 40,852 ops/sec [40,675..40,976] → 39,122 ops/sec [38,801..39,370] 🔴 -4.2%
toBase64 → fromBase64 (450 bytes) 53,780 ops/sec [53,405..54,016] → 50,008 ops/sec [49,576..53,289] 🔴 -7.0% 86,446 ops/sec [86,293..87,453] → 81,948 ops/sec [81,669..82,386] 🔴 -5.2%
toHex → fromHex (450 bytes) 102,090 ops/sec [101,478..102,884] → 107,010 ops/sec [106,455..107,345] 🟢 +4.8% 110,367 ops/sec [109,575..111,193] → 106,709 ops/sec [106,533..106,836] 🔴 -3.3%
weak-collections.js — Interp: 🟢 3, 🔴 7, 5 unch. · avg +0.7% · Bytecode: 🟢 7, 🔴 6, 2 unch. · avg +15.5%
Benchmark Interpreted Δ Bytecode Δ
constructor from 50 entries 13,502 ops/sec [13,290..14,494] → 12,106 ops/sec [11,765..12,232] 🔴 -10.3% 13,835 ops/sec [13,523..14,253] → 11,844 ops/sec [11,687..12,203] 🔴 -14.4%
set 50 object keys 4,467 ops/sec [4,411..4,508] → 4,424 ops/sec [4,283..4,495] ~ overlap (-1.0%) 5,569 ops/sec [5,534..5,694] → 5,073 ops/sec [5,011..5,144] 🔴 -8.9%
get lookups (50 entries) 59,847 ops/sec [58,774..60,823] → 60,052 ops/sec [58,619..60,770] ~ overlap (+0.3%) 93,257 ops/sec [79,427..95,774] → 133,750 ops/sec [81,778..137,126] ~ overlap (+43.4%)
has checks (50 entries) 78,487 ops/sec [77,534..78,818] → 75,806 ops/sec [74,798..77,539] ~ overlap (-3.4%) 118,625 ops/sec [117,280..124,635] → 170,556 ops/sec [168,959..171,134] 🟢 +43.8%
delete entries 4,478 ops/sec [4,443..4,497] → 4,129 ops/sec [4,059..4,150] 🔴 -7.8% 5,619 ops/sec [5,456..5,689] → 8,123 ops/sec [8,086..8,201] 🟢 +44.6%
non-registered symbol keys 10,848 ops/sec [10,789..10,983] → 10,006 ops/sec [9,896..10,449] 🔴 -7.8% 13,586 ops/sec [13,528..13,633] → 19,566 ops/sec [19,483..19,649] 🟢 +44.0%
getOrInsert 7,236 ops/sec [7,161..7,337] → 4,020 ops/sec [3,947..4,039] 🔴 -44.4% 5,191 ops/sec [5,163..5,237] → 7,549 ops/sec [7,533..7,664] 🟢 +45.4%
getOrInsertComputed 3,439 ops/sec [3,359..3,455] → 2,025 ops/sec [2,009..2,050] 🔴 -41.1% 2,708 ops/sec [2,692..2,731] → 3,893 ops/sec [3,824..3,928] 🟢 +43.7%
forced gc live-key retention 6,787 ops/sec [4,263..6,863] → 4,196 ops/sec [4,159..4,697] ~ overlap (-38.2%) 4,632 ops/sec [4,613..4,665] → 6,688 ops/sec [6,517..6,749] 🟢 +44.4%
constructor from 50 values 18,169 ops/sec [18,154..18,201] → 15,382 ops/sec [14,598..17,035] 🔴 -15.3% 18,853 ops/sec [18,270..19,246] → 27,624 ops/sec [27,375..27,694] 🟢 +46.5%
add 50 object values 4,995 ops/sec [4,957..5,005] → 5,245 ops/sec [4,734..5,293] ~ overlap (+5.0%) 6,305 ops/sec [6,265..6,389] → 9,106 ops/sec [5,529..9,145] ~ overlap (+44.4%)
has checks (50 values) 79,355 ops/sec [78,845..79,922] → 76,332 ops/sec [75,119..78,535] 🔴 -3.8% 123,811 ops/sec [122,521..124,954] → 111,621 ops/sec [104,468..112,916] 🔴 -9.8%
delete values 14,169 ops/sec [13,740..14,218] → 21,418 ops/sec [18,518..21,464] 🟢 +51.2% 25,381 ops/sec [25,246..25,483] → 13,653 ops/sec [13,547..13,695] 🔴 -46.2%
non-registered symbol values 11,036 ops/sec [10,914..11,266] → 17,995 ops/sec [17,914..18,094] 🟢 +63.0% 23,480 ops/sec [23,396..23,594] → 12,682 ops/sec [12,632..12,695] 🔴 -46.0%
forced gc pruning smoke 5,215 ops/sec [5,196..5,281] → 8,538 ops/sec [8,461..8,567] 🟢 +63.7% 9,385 ops/sec [9,307..9,543] → 5,441 ops/sec [5,381..5,469] 🔴 -42.0%

Deterministic profile diff

base64

  • 🔴 OP_GET_UPVALUE: 8 → 0 (REMOVED)

float16array

  • 🔴 OP_GET_UPVALUE: 307 → 0 (REMOVED)
  • 🔴 OP_GET_GLOBAL: 136 → 443 (+225.7%)

jsx

  • 🔴 OP_GET_UPVALUE: 53 → 0 (REMOVED)

uint8array-encoding

  • 🔴 OP_GET_UPVALUE: 18 → 0 (REMOVED)

Measured on ubuntu-latest x64. Benchmark ranges compare cached main-branch min/max ops/sec with the PR run; overlapping ranges are treated as unchanged noise. Percentage deltas are secondary context.

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test262 Conformance

Category Run Passed Δ Pass Failed Pass-rate Δ Rate
built-ins 23,449 16,067 +1 7,377 68.5% ±0pp
harness 116 72 ±0 44 62.1% ±0pp
intl402 3,324 892 ±0 2,432 26.8% ±0pp
language 23,635 14,203 ±0 9,432 60.1% ±0pp
staging 1,484 571 ±0 910 38.5% ±0pp
total 52,008 31,805 +1 20,195 61.2% ±0pp

Areas closest to 100%

Area Pass rate Δ vs main Passing
built-ins/WeakMap 99.3% ±0pp 140 / 141
built-ins/WeakSet 98.8% ±0pp 84 / 85
language/future-reserved-words 98.1% ±0pp 53 / 54
Per-test deltas (+1 / -0)

Newly passing (1):

  • built-ins/Number/prototype/toExponential/undefined-fractiondigits.js

Steady-state failures are non-blocking; regressions vs the cached main baseline (lower total pass count, or any PASS → non-PASS transition) fail the conformance gate. Measured on ubuntu-latest x64, bytecode mode. Areas grouped by the first two test262 path components; minimum 25 attempted tests, areas already at 100% excluded. Δ vs main compares against the most recent cached main baseline.

@frostney frostney force-pushed the t3code/issue665 branch 3 times, most recently from 434a879 to ddf7b15 Compare May 20, 2026 21:19
@frostney
Fix bytecode live module lexical exports
cd37e11 
Ensure top-level module lexical bindings are marked global-backed in bytecode mode so assignments update the module scope used for named exports. Add a regression for reassigned simple and destructured top-level lexical exports.
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Bytecode module exports can read stale top-level let bindings

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@frostney