In https://github.com/python/importlib_metadata/issues/324, I painstakingly created a library to perform robust performance monitoring of behaviors in the library and specifically added tests that capture the performance of entry_points against importlib_metadata 1.4 (the same code used in Python 3.9). I furthermore attempted to replicate the reported performance concerns reported using the exact commands, and even then, Python 3.10b3 indicates a 3x+ improvement in performance, dispelling the claim that the issue is order of complexity of the resolution of entry points by group.

I'll be open to new reports about performance concerns or other regressions w.r.t. the importlib.metadata changes, but please do not re-open this issue.