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Re^6: Substitution unexpectedly very slow, in Strawberry

by syphilis (Archbishop)
on Aug 07, 2023 at 13:57 UTC ( [id://11153758] : note . print w/replies, xml ) Need Help??

in reply to Re^5: Substitution unexpectedly very slow, in Strawberry
in thread Substitution unexpectedly very slow, in Strawberry

This suggests it's not COW related?

Well, it's certainly not related to the introduction of the new COW in perl-5.20.0.
I've just fired up my old windows 7 machine that has all of the ".0" stable releases from 5.10.0.
The demo script ran fine from 5.18 to 5.26.0 - I didn't test back any further back than 5.18.0.
The slowdown comes with perl-5.28.0, and then persists right up to (and including) perl-5.36.0 - which is the latest perl version on that machine.
A quick browse of the perl5280delta didn't really sound any alarms, though I noticed the following:
[CVE-2017-12814] $ENV{$key} stack buffer overflow on Windows A possible stack buffer overflow in the %ENV code on Windows has b +een fixed by removing the buffer completely since it was superfluous a +nyway. [GH #16051] <>
Is there possibly anything suspicious in that ? (It was the fact that it involves the removal of a buffer that led me to wonder ...)