FIX: Slow download speeds in Python client

Author: nmacholl

CHANGELOG.md

@@ -5,6 +5,7 @@
 #### Bug fixes
 - Fixed an issue where the `Live` client would not raise an exception when reading an incompatible DBN version
 - Fixed an issue where sending lots of subscriptions could cause a `BufferError`
+- Fixed an issue where `Historical.batch.download` was slow
 
 ## 0.24.1 - 2023-12-15
 

databento/historical/api/batch.py

@@ -370,7 +370,7 @@ def _download_file(
 
             logger.debug("Starting download of file %s", output_path.name)
             with open(output_path, mode=mode) as f:
-                for chunk in response.iter_content():
+                for chunk in response.iter_content(chunk_size=None):
                     f.write(chunk)
             logger.debug("Download of %s completed", output_path.name)