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{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"Update shutil.rst to clarify copy performance on Windows","articleBody":"# Documentation\n\nThe original documention https://docs.python.org/3/library/shutil.html#shutil-platform-dependent-efficient-copy-operations about Platform-dependent efficient for Windows only mentioned that `shutil.copyfile()`, but which is a bad read and write loop still.\n\nActually the `shutil.copy2()` used the Windows API COPYFILE2, which is faster, and native call which means don't copy to memory on userspace, and support copy-on-write. \nSo this should be mentioned in documention to let people know rather than only knowing until read all the opened issues on github and source code of `shutil`.\n\nRelated info:\nhow `shutil` was implemented: https://github.com/python/cpython/pull/7160.\nwhy only `shutil.copy2()` use Windows API `COPYFILE2` while `shutil.copyfile()` not: https://github.com/python/cpython/issues/137074.\ndata that shows `shutil.copy2()` or Windows API `COPYFILE2` can accelerate transfer speed: https://github.com/antirotor/speedcopy.\nPR of new version copy2 implemented: https://github.com/python/cpython/pull/105055.\n\u003c!-- gh-linked-prs --\u003e\n### Linked PRs\n* gh-142408\n\u003c!-- /gh-linked-prs --\u003e\n","author":{"url":"https://github.com/NewUserHa","@type":"Person","name":"NewUserHa"},"datePublished":"2025-12-08T09:00:24.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":0},"url":"https://github.com/142407/cpython/issues/142407"}