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gh-91349: Adjust default compression level to 6 (down from 9) in gzip and tarfile #131470

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gh-91349: Adjust default compression level to 6 (down from 9) in gzip and tarfile #131470

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@morotti morotti commented Mar 19, 2025 •
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It is the default level used by most compression tools and a better tradeoff between speed and performance.

see discussion in #91349 (comment)

📚 Documentation preview 📚: https://cpython-previews--131470.org.readthedocs.build/

@morotti morotti requested a review from ethanfurman as a code owner March 19, 2025 16:11
@bedevere-app bedevere-app bot mentioned this pull request Mar 19, 2025
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@merwok merwok added awaiting core review stdlib Python modules in the Lib dir type-feature A feature request or enhancement and removed awaiting core review labels May 19, 2025
@morotti morotti force-pushed the rmorotti-compresion-level branch from e2d0562 to a2d0966 Compare June 25, 2025 13:22
@rmmancom
pythongh-91349: Adjust default compression level to 6 (down from 9) i…
b17e21d 
…n gzip and tarfile

It is the default level used by most compression tools and a
better tradeoff between speed and performance.
@morotti morotti force-pushed the rmorotti-compresion-level branch from a2d0966 to b17e21d Compare June 25, 2025 13:31
merwok
merwok reviewed Jun 25, 2025
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morotti commented Jun 25, 2025

@merwok I added the versionchanged notes. and found another comment in tarfile.rst to adjust.
it's a bit repetitive to add on each signature I suppose but I suppose it's fine.

You can review again.

@emmatyping emmatyping removed type-feature A feature request or enhancement stdlib Python modules in the Lib dir labels Jun 26, 2025
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morotti commented Jun 27, 2025

@gpshead you've replied multiple times to my questions on improving compression code with "PR welcome". maybe you would be interested in reviewing this PR?

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