According to the developers, the version of PHP 7.4 shows itself much faster - by 2 times compared to version 5.6 and 4 times as compared to version 5.2.
Also in PHP 7.4 runtime and memory usage was reduced, as compared to the 7.3 version of the language.
Test results for WordPress CMS (taken from here):
- WordPress 5.3 PHP 5.6: 97.71 requests per second
- WordPress 5.3 PHP 7.0: 256.81 requests per second
- WordPress 5.3 PHP 7.1: 256.99 requests per second
- WordPress 5.3 PHP 7.2: 273.07 requests per second
- WordPress 5.3 PHP 7.3: 305.59 requests per second
- WordPress 5.3 PHP 7.4: 313.42 requests per second
- PHP 7.4 is a winner by proving that it is slightly faster than PHP 7.3. And if you compare PHP 7.4 to PHP 5.6, you'll see it can process 3 times more requests per second!
