Since it's running mypyc (https://mypyc.readthedocs.io/en/latest/index.html ) on the imports under the hood, I'm struggling to see why you'd want to limit yourself to the standard library instead of just compiling your whole program as a module with mypyc directly?

At the same time, if the gains are consistent, I also feel that CPython should just compile an entire standard library on installation.

EDIT: benchmarks for mypyc look impressive, only exceptions are slower:

• https://github.com/mypyc/mypyc-benchmark-results/blob/master/reports/summary-microbenchmarks.md
• https://github.com/mypyc/mypyc-benchmark-results/blob/master/reports/summary-main.md

Hmmm. Interesting. Why not a project that just simply writes the (Python parts of the) standard library in C directly?