Ken Jin <kenjin4...@gmail.com> added the comment:

Sadly, I can't reproduce the speedups OP reported from disabling 
test_patma.TestTracing. It's not any faster than what we have with PR28475. 
(See attached pyperformance).

I'm looking forward to their other fix :). Even if it comes in 3.10.1 that's 
still a huge win. I don't think everyone immediately upgrades when a new Python 
version arrives.

IMO, we should note in What's New that only for Windows, 3.10.0 has a slight 
slowdown. Some use cases are slower (by >10%!), while some people won't feel a 
thing. (Then again, maybe this is offset by the LOAD_ATTR opcache in 3.10 and 
we get a net zero effect?). I'll submit a PR soon if the full fix misses 3.10.0.

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Added file: https://bugs.python.org/file50315/310rc2patched_vs_310rc2notrace.txt

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