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Document `asyncio` performance improvement in What's New (#103370) 

Co-authored-by: Alex Waygood <Alex.Waygood@Gmail.com>
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Kumar Aditya 2023-04-09 07:29:08 +05:30 committed by GitHub
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@ -210,6 +210,11 @@ array
asyncio
-------
* The performance of writing to sockets in :mod:`asyncio` has been
significantly improved. ``asyncio`` now avoids unnecessary copying when
writing to sockets and uses :meth:`~socket.socket.sendmsg` if the platform
supports it. (Contributed by Kumar Aditya in :gh:`91166`.)
* On Linux, :mod:`asyncio` uses :class:`~asyncio.PidfdChildWatcher` by default
if :func:`os.pidfd_open` is available and functional instead of
:class:`~asyncio.ThreadedChildWatcher`.