[pypy-dev] Program slower on Pypy 7.3.3 (3.7.9) than CPython 3.9.

Dan Stromberg strombrg at gmail.com
Mon Mar 15 18:16:28 EDT 2021

And it's opensource, though many of the inputs are licensed.

The code is at https://stromberg.dnsalias.org/~strombrg/music-pipeline/ (

It appears to be more than 10x slower.

I haven't profiled it yet.  I believe it's probably the "Blocklisting
files..." part that's slow.  That part is O(n*m), and seems to take
forever.  It's heavy on regular expressions.

Are regular expressions expected to be slow on Pypy3?


Dan Stromberg
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