AFAICT this is dead (no updates in four years) and "alpha software...only recommended for production use cases with careful testing, and if you are willing to contribute fixes or to work around issues you will encounter." Unfortunate, because it's pretty cool.
the repo says the code is in the mypy repo and it looks like it is maintained in there. so I think it has had updates the last four years?
Yeah, mypy uses it themselves for their releases. I think they get 5x speedups empirically
Wow those are pretty chunky improvements over vanilla