Preloading
Preloading — Dmitri Stogov
OPcache is awesome
It prevents a lot of work "compiling" PHP files
Still overhead: class resolving, checking whether files have modified, cache size/evictions
Added in 7.4:
A new %php.ini% directive: *%opcache.preload%*
With this directive you can specify a single PHP file which will perform the preloading task.
https://wiki.php.net/rfc/preload — https://github.com/php/php-src/pull/3538