SERVERBORNForged for speed
The ServerBorn blog

Notes from the forge.

Performance engineering, security hardening, and WordPress operations. Written by the people who run the metal.

PHP Workers: The Quiet Limit on Concurrent Traffic

Every WordPress request has to pass through a PHP worker, and there are only so many to go around. Here is what that limit actually means, how it fails, and how caching lets you serve far more traffic without adding a single worker.

by Robbie·May 23, 2026·5 min read