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GeezerVison is showing github.com — Improve import time of various stdlib modules · Issue #137855 · python/cpython

Improve import time of various stdlib modules #137855

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Improve import time of various stdlib modules#137855
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3.15bugs and security fixesbugs and security fixesperformancePerformance or resource usagePerformance or resource usagestdlibStandard Library Python modules in the Lib/ directoryStandard Library Python modules in the Lib/ directorytype-featureA feature request or enhancementA feature request or enhancement

Description

@ofek
ofek
opened on Aug 16, 2025
Issue body actions

Feature or enhancement

Proposal:

Following on from #118761 (comment), further improvements can be made to import times.

Notes

We should backport ensure_lazy_imports tests for the 3.14 improvements, to help guard against regressions.

Linked PRs

  • gh-137855: Improve import time of sqlite3 #131796
  • gh-137855: email.quoprimime removing re import #132046
  • gh-137855: Optimise import time for textwrap #131956
  • gh-137855: Lazy import inspect module in dataclasses #144387
  • gh-137855: Improve import time of pathlib #146327
  • gh-137855: Improve import time of dataclasses by lazy importing re and copy modules #148379
  • gh-137855: Improve import time of textwrap by lazy importing re modules #150156
Reacted by layday

Activity

  1. ofek
    added
    type-featureA feature request or enhancementA feature request or enhancement
    on Aug 16, 2025
  2. StanFromIreland
    added
    performancePerformance or resource usagePerformance or resource usage
    stdlibStandard Library Python modules in the Lib/ directoryStandard Library Python modules in the Lib/ directory
    on Aug 16, 2025
  3. Wulian233
    added a commit that references this issue on Aug 17, 2025

    Rename pythongh-137855

    f434be3
  4. hugovk
    added a commit that references this issue on Apr 11, 2026

    gh-137855: Improve import time of dataclasses by lazy importing `re` …

    dd2735d
  5. ljfp
    added a commit that references this issue on Apr 25, 2026

    pythongh-137855: Improve import time of dataclasses by lazy importing…

    db4cffa
  6. JelleZijlstra
    added a commit that references this issue on Apr 26, 2026

    gh-137855: Lazy import `inspect` module in dataclasses (#144387)

    0a39730
  7. encukou
    added a commit that references this issue on May 5, 2026

    gh-137855: Improve import time of `pathlib` (GH-146327)

    ffb543d
  8. serhiy-storchaka
    added
    topic-importlib
    on Jul 3, 2026
  9. hugovk
    removed
    topic-importlib
    on Jul 25, 2026

  10. hugovk commented on Jul 25, 2026

    @hugovk
    hugovk
    on Jul 25, 2026
    Member
    More actions

    3.15 is in feature freeze and almost in RC, let's close this and continue in #154675 for 3.16. Thanks all! 🚀

  11. hugovk
    closed this as completedon Jul 25, 2026
  12. hugovk
    added
    3.15bugs and security fixesbugs and security fixes
    on Sep 8, 2026
  13. ambv
    added 2 commits that reference this issue on Oct 21, 2026

    Fix CI: add news entry for textwrap import-time optimisation (pythong…

    ad5a3ec

    Fix CI: add news entry for textwrap import-time optimisation (pythong…

    b4e3ec3
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