[issue32346] Speed up slot lookup for class creation

[Antoine Pitrou]

Antoine Pitrou <pitrou at free.fr> added the comment:

> Since benchgcclasses.py doesn't creates dunder methods,
cache doesn't have GC-tracked tuples, and ref cycles.

Hmm, you're right, thank you.  I can also reproduce your numbers here (using benchgcclasses2.py).  There's definitely an impact.

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue32346>
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