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

Dan Stromberg drsalists at gmail.com
Tue Mar 16 00:20:14 EDT 2021

I put a small SSCCE for this at

It's almost 10x slower, not quite as much as music-pipeline.

On Mon, Mar 15, 2021 at 3:17 PM Dan Stromberg <strombrg at gmail.com> wrote:

> And it's opensource, though many of the inputs are licensed.
> The code is at https://stromberg.dnsalias.org/~strombrg/music-pipeline/ (
> https://stromberg.dnsalias.org/svn/music-pipeline/trunk/)
> 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?
> Thanks.
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