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

kumaraditya303 · AlexWaygood · web-flow · commit 63dc969ec612 · 2023-04-09T07:29:08.000+05:30
Co-authored-by: Alex Waygood &lt;Alex.Waygood@Gmail.com&gt;
diff --git a/Doc/whatsnew/3.12.rst b/Doc/whatsnew/3.12.rst
@@ -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`.
