PHP 8.1: real-life performance benchmarks
Written on 2021-11-25I 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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