This is great! Always love to see performance improve. I have to admit, anytime I think "gigabytes per second" my mind does not go to Python at all. Would love to see that change.

> "Python used to have limited parallelism, due to its global interpreter lock (GIL). Only one thread could run Python code at a time.”

It is still limited this way in the regular build, there's no "used to". Author should fix that.