WordPress Tutorials, Security Guides & Performance Tips

Quick answer: PHP performance optimization for high-traffic sites comes down to five levers: run a current PHP version with OPcache enabled, add an object cache like Redis, tune PHP-FPM worker limits to your server’s real capacity, cut database query overhead, and profile before you guess. Sites that skip profiling almost always fix the wrong bottleneck first. A PHP site that loads fine for ten visitors can fall apart at ten thousand. The code did not get slower. The bottlenecks that