This was the investigation: https://discuss.python.org/t/python-3-11-performance-with-fr...

Initially we just turned off frame pointers for the Python 3.9 interpreter in Fedora. They are back on in Python 3.12 where it seems the upstream bug has been fixed, although I can't find the actual fix right now.

Fedora tracking bug: https://bugzilla.redhat.com/2158729

Fedora change in Python 3.9 to disable frame pointers: https://src.fedoraproject.org/rpms/python3.9/c/9b71f8369141c...

Ah right, thanks, I remember I saw Andrii's analysis in the other thread. https://pagure.io/fesco/issue/2817#comment-826636