[issue45923] Improve performance of sys.settracing based tools.

[Mark Shannon]

Change by Mark Shannon <mark at hotpy.org>:


----------
keywords: +patch
pull_requests: +28578
stage:  -> patch review
pull_request: https://github.com/python/cpython/pull/30364

_______________________________________
Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue45923>
_______________________________________