FrankenPHP vs PHP-FPM (Part 3): CPU, Memory, and the Hidden Cost of Doing Nothing

A comprehensive performance comparison between FrankenPHP and PHP-FPM focusing on CPU and memory usage patterns during both active load and idle states. The analysis reveals that FrankenPHP with worker mode delivers 3x better throughput and 60% lower latency than PHP-FPM, but consumes more memory even when idle (85MB vs 25MB). PHP-FPM excels for low-traffic applications due to minimal resource usage when inactive, while FrankenPHP becomes more cost-effective for high-traffic scenarios due to its persistent application state and reduced per-request overhead.