Carl Meyer <c...@oddbird.net> added the comment:

Draft PR is up for consideration. Perf data in 
https://gist.github.com/carljm/987a7032ed851a5fe145524128bdb67a

Overall it seems like the base implementation is perf neutral -- maybe a slight 
impact on the pickle benchmarks? With all module global dicts (uselessly) 
watched, there are a few more benchmarks with small regressions, but also some 
with small improvements (just noise I guess?) -- overall still pretty close to 
neutral.

Comments welcome!

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<https://bugs.python.org/issue46896>
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