readme improvements

Author: georges-hatem

entries/ghatem-fpc/README.md

@@ -233,3 +233,12 @@ a few performance improvements, and measurements as per gcarreno on a busy machi
  - using mORMot's `crc32c` function instead of the native `crc32`, time dropped to 3.8 seconds
  - I had removed my pre-allocated records implementation. restored it in the custom dictionary class, time dropped to 3.2 seconds
  - skipping a few chars that we don't need to bother with, no timing yet
+
+## v.5 (2024-04-27)
+
+Various attempts at dictionary sizes, ranging from 45k to 95k. Even though larger dictionaries reduce collision tremendously, a dictionary of size 45k was still optimal.
+
+Another trial with various hash functions, a simple modulus vs. a slightly more complex one: modulus is slower on my PC, remains to try on the test env.
+Can be tested with the HASHMULT build option
+
+Finally, it seems choosing a dictionary size that is a prime number is also recommended: shaves 1 second out of 20 on my PC.