I put together a little python runtime comparison, with an embarallel, cpu-heavy threading microbenchmark.
It turns out that the performance-oriented Python implementations, Pypy3 and Nuitka3, are both poor at threading, as is CPython of course. On the plus side for CPython, adding cpu-heavy threads doesn't cause performance to get significantly worse anymore. The pleasant result is that Micropython threads pretty well! There's a graph of the performance curves at: https://stromberg.dnsalias.org/~strombrg/python-thread-comparison/ -- https://mail.python.org/mailman/listinfo/python-list
