Sorry Folks, but I have to provide some update about the results: Unfortunately, due to a silly bug in my calculator code, the % differences in the benchmark results were slightly off from their real values, so I have just retroactively adjusted them. In fact, the Symfony demo app on PHP 8.1 is ~23% faster than on PHP 7.4, while Laravel runs ~21.5% faster on PHP 8.1 than on PHP 7.4. In my opinion, this performance increase is still very remarkable, so I'm not disappointed at all that the improvement is slightly less dramatic than I previously suggested. In any case, sorry for the misleading news!
I wish a happy PHP 8.1 release party to everyone: Máté
