I don't know personally. In Oct 2017, the PHP version was slower: http://web.archive.org/web/20171027211857/http://benchmarksgame.alioth.debian.org/u64q/regexre

I don't know personally. In Oct 2017, the PHP version was slower: http://web.archive.org/web/20171027211857/http://benchmarksgame.alioth.debian.org/u64q/regexredux.html http://web.archive.org/web/20171027211857/http://benchmarksg... Today, it is faster: https://benchmarksgame-team.pages.debian.net/benchmarksgame/performance/regexredux.html https://benchmarksgame-team.pages.debian.net/benchmarksgame/... As far as I can tell, the source code of the benchmark didn't change at all. The only difference between them is that former uses PHP 7.1 and the latter uses PHP 7.2. So... I would start at the differences between PHP 7.1 and PHP 7.2. I would also first attempt to reproduce the result locally, to rule out changes in environment in the benchmark game (speculatively speaking).