This is about speeding up some string searches in CPython, with an aim of avoiding pathological cases. One given example goes from over three hours (currently released CPython) to 0.1 seconds (proposed patch).<p>Here's the bug report that lead to that discussion: "bytes.find consistently hangs in a particular scenario" -> <a href="https://bugs.python.org/issue41972" rel="nofollow">https://bugs.python.org/issue41972</a>