All 7 Performance Optimization & OPcache questions
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What are some common, straightforward ways to identify performance bottlenecks in a PHP application before attempting to optimize it? How does the N plus one query problem impact performance, and what general strategies help identify and fix this common performance issue? How does properly configuring PHP-FPM's process management settings, such as pm.max_children, affect an application's ability to handle concurrent traffic efficiently? How does lazy loading versus eager loading of resources and how minimizing unnecessary work within a request's critical path help improve overall PHP application response times? How does OPcache's file validation and preloading feature work, and what performance benefit does preloading provide beyond standard bytecode caching? How should a team approach a comprehensive performance optimization effort for a PHP application experiencing slow response times under production load, prioritizing which areas to address first?
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PHP › Performance Optimization & OPcache

What is OPcache, and how does it improve PHP application performance by caching compiled bytecode?

Beginner

Answer

OPcache is a built in PHP extension that stores precompiled script bytecode in shared memory, meaning PHP does not need to parse and compile the same PHP source file from scratch on every single request, which significantly reduces CPU usage and improves response times, and enabling OPcache is generally considered one of the single most impactful and easiest performance improvements you can make for any production PHP application.
; php.ini configuration
opcache.enable=1
opcache.memory_consumption=128
opcache.max_accelerated_files=10000
Real-world example A company enables OPcache on their production servers and immediately observes a significant reduction in average response time, since PHP no longer needs to repeatedly parse and compile the exact same application code on every incoming request.

Common follow-ups: Is OPcache enabled by default in a standard PHP installation?;What happens to OPcache's cached bytecode when a PHP file is updated on disk?

Deployment & Hosting for PHP Applications;Caching Strategies in PHP
All 7 Performance Optimization & OPcache questions