OPcache Tuning & Preloading in PHP 8.3 & 8.4: Shaving 40ms off API Response Times

Eliminating File Compilation at Runtime

In standard PHP-FPM request lifecycles, files are re-checked for timestamp changes against the filesystem. With OPcache Preloading introduced in modern PHP, the server compiles all framework classes, traits, and interfaces into shared server memory once at server startup, making them globally available to every request with zero overhead.

Preloading Configuration in Laravel & Symfony

opcache.preload=/var/www/jaydigit/preload.php
opcache.preload_user=www-data
opcache.validate_timestamps=0

Setting validate_timestamps=0 in production completely disables stat calls, shaving 25ms to 45ms from high-throughput microservices and API gateways.