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[3.13] GH-109975: Copyedit 3.13 What's New: Optimizations (GH-123301) (#123308) 

Co-authored-by: Adam Turner <9087854+AA-Turner@users.noreply.github.com>
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Doc/whatsnew/3.13.rst
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@ -487,6 +487,8 @@ but the platform is not yet officially supported.
.. seealso:: :pep:`730`, :pep:`738`
.. _whatsnew313-incremental-gc:
Incremental garbage collection
------------------------------
@ -1465,24 +1467,33 @@ zipimport
Optimizations
=============
* :func:`textwrap.indent` is now ~30% faster than before for large input.
* The new :ref:`incremental garbage collector <whatsnew313-incremental-gc>`
means that maximum pause times are reduced
by an order of magnitude or more for larger heaps.
(Contributed by Mark Shannon in :gh:`108362`.)
* Several standard library modules have had
their import times significantly improved.
For example, the import time of the :mod:`typing` module
has been reduced by around a third by removing dependencies
on :mod:`re` and :mod:`contextlib`.
Other modules to enjoy import-time speedups include
:mod:`email.utils`, :mod:`enum`, :mod:`functools`,
:mod:`importlib.metadata`, and :mod:`threading`.
(Contributed by Alex Waygood, Shantanu Jain, Adam Turner, Daniel Holla,
and others in :gh:`109653`.)
* :func:`textwrap.indent` is now around 30% faster than before for large input.
(Contributed by Inada Naoki in :gh:`107369`.)
* The :mod:`subprocess` module uses :func:`os.posix_spawn` in more situations
including the default where ``close_fds=True`` on many modern platforms. This
should provide a noteworthy performance increase launching processes on
FreeBSD and Solaris. See the :ref:`subprocess <whatsnew313-subprocess>`
section above for details.
* The :mod:`subprocess` module now uses the :func:`~os.posix_spawn` function in
more situations, including when *close_fds* is ``True`` (the default)
on many modern platforms.
This should provide a notable performance increase
when launching processes on FreeBSD and Solaris.
See the :ref:`subprocess <whatsnew313-subprocess>` section above for details.
(Contributed by Jakub Kulik in :gh:`113117`.)
* Several standard library modules have had their import times significantly
improved. For example, the import time of the :mod:`typing` module has been
reduced by around a third by removing dependencies on :mod:`re` and
:mod:`contextlib`. Other modules to enjoy import-time speedups include
:mod:`importlib.metadata`, :mod:`threading`, :mod:`enum`, :mod:`functools`
and :mod:`email.utils`.
(Contributed by Alex Waygood, Shantanu Jain, Adam Turner, Daniel Hollas and
others in :gh:`109653`.)
Removed Modules And APIs
========================