Code run with cProfile performance regression in 3.11

See this discussion on [Discourse](https://discuss.python.org/t/project-run-on-python-3-11-0b1-is-1-6x-slower-than-python-3-10/16067/3).

~We could speed up cProfile a few ways. I'll try to work on a few PRs.~ We first need to find out why cProfile is so slow. I'm not sure if we can backport fixes. Though a 1.6x slowdown seems pretty significant.
