Project run on Python 3.11.0b1 is 1.6x slower than Python 3.10?

The 1.6x slower part is running python profiler.py (runs CProfiler in the file) after cloning my repository and installing the requirements.

I am using pyenv’s builds of Python 3.10.0 and 3.11.0b1 (CPython).

Side discussion - how would I add my project as a benchmark? Is it possible to add my project as a submodule? Or do I need to copy everything over as a one-time export?