Feature or enhancement
Following 6d59c9e, typing._ProtocolMeta.__instancecheck__ uses inspect.getattr_static in a tight loop, where it had previously used hasattr. This improves semantics in several highly desirable ways, but causes a considerable slowdown for _ProtocolMeta.__instancecheck__, as inspect.getattr_static is much slower than hasattr.
The performance hit to _ProtocolMeta.__instancecheck__ has already been mostly mitigated through several typing-specific optimisations that are tracked in this issue:
Performance of typing._ProtocolMeta._get_protocol_attrs and isinstance #74690
However, it would be good to also see if we can improve the performance of inspect.getattr_static. This will not only improve the performance of isinstance() checks against classes subclassing typing.Protocol. It will also improve the performance of all other tools that use inspect.getattr_static for introspection without side effects.
Linked PRs
gh-103193: Micro-optimise helper functions for inspect.getattr_static #103195
gh-103193: Use LBYL idioms rather than EAFP in inspect.getattr_static #103318
gh-103193: Speedup and inline inspect._is_type #103321
gh-103193: cache calls to inspect._shadowed_dict in inspect.getattr_static #104267
gh-103193: Improve getattr_static test coverage #104286
[3.11] gh-103193: Improve getattr_static test coverage (GH-104286) #104290
gh-103193: Fix refleaks in test_inspect and test_typing #104320