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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 wants to merge7 commits intopython:main
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fromman-group:rmorotti-compresion-level

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morotti
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@morottimorotti commentedMar 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/

barneygale, Zaczero, and mxmlnkn reacted with thumbs up emoji
…n gzip and tarfileIt is the default level used by most compression tools and abetter tradeoff between speed and performance.
@morottimorottiforce-pushed thermorotti-compresion-level branch froma2d0966 tob17e21dCompareJune 25, 2025 13:31
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@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.

@emmatypingemmatyping removed type-featureA feature request or enhancement stdlibPython modules in the Lib dir labelsJun 26, 2025
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@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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can anybody review the PR please?

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are you two saying that this fix will not be able to ship with python 3.14?

set versionchanged to nextCo-authored-by: Pieter Eendebak <pieter.eendebak@gmail.com>
set versionchanged to next
set versionchanged to next
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done, adjusted all theversionchanged tonext

@merwokmerwok added the 3.15new features, bugs and security fixes labelJul 18, 2025
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@eendebakpteendebakpteendebakpt left review comments

@ethanfurmanethanfurmanAwaiting requested review from ethanfurmanethanfurman is a code owner

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