PHP 8.1: real-life performance benchmarks

I did a very quick performance test because I wanted to know the impact of PHP 8.1 on my real-life projects.

These benchmarks were taken on my local machine, and only meant to measure the relative difference between PHP 8.0 and 8.1. I benchmarked a page that showed lots of data, with lots of classes loaded, as I expected that inheritance cache would have the largest performance impact.

Metric	PHP 8.0	PHP 8.1
Requests per second (#/sec)	32.02	34.75
Time per request (ms)	31.232	28.777

The results seem to be in line what what Dmitry originally reported when he added this feature: a 5-8% performance increase.

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