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substr() with replacement slowdown on large strings

#23967

· bbrtj opened

on Nov 28, 2025

v5.35.5 consumes significantly more memory than v5.35.4

#19223

· andk opened

on Nov 8, 2021

Moving re_intuit_start into regex seems to be a regression

type-regex-codeblocks

#18566

· demerphq opened

on Feb 12, 2021

performance: t/comp/utf.t

#18300

· hvds opened

on Nov 6, 2020

[feature] Consider compiling Perl with no-semantic-interposition when available

Feature Request

#17963

· atoomic opened

on Jul 10, 2020

Complete Mauke's work on __builtin_*_overflow for faster overflow checks?

#17779

· richardleach opened

on May 10, 2020

regexp matching searches for floating substr too often

#17427

· hvds opened

on Jan 17, 2020

Simple regular expression substitutions much slower than before 5.20

#17253

· dur-randir opened

on Nov 4, 2019

[feature] optimized OPs for some common patterns

Feature Request

#17190

· atoomic opened

on Oct 20, 2019

run loop optimization

#15836

· p5pRT opened

on Jan 25, 2017

Pathological performance problem with RegExp engine

#12360

· p5pRT opened

on Aug 28, 2012

cygwin-thread-multi-64int is slow in multi-threaded code that relies heavily on split command

#11487

· p5pRT opened

on Jul 11, 2011