Python 3.11 was an improvement over 3.10, however 3.12 performance is worse, despite ongoing faster-cpython project.

I have observed that after upgrading my application that is running CPU intensive calculations using pandas.

Some benchmarks found in the web say that worse performance is generally for AMD and for Intel should be better.
And maybe by accident, but a graph comparing 3.11 vs 3.12 is missing from faster-cpython github benchmark page.