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What is OPcache and how do I configure it for maximum PHP performance?

OPcache is a built-in PHP extension that stores compiled PHP bytecode in shared memory. Without OPcache, PHP re-reads, re-parses, and re-compiles every script on every request — thousands of file system reads per second on busy sites. With OPcache, compiled scripts are cached in RAM and reused — eliminating file reads and compilation entirely. Performance improvement: 2-10x faster PHP execution depending on application. OPcache is enabled by default in PHP 5.5+ but often misconfigured. Optimal settings in php.ini: opcache.memory_consumption=256 (MB of shared memory), opcache.max_accelerated_files=20000 (number of cached scripts), opcache.validate_timestamps=0 (never check for file changes — PRODUCTION only, re-enable during development), opcache.revalidate_freq=0, opcache.jit=1255, opcache.jit_buffer_size=128M (enables JIT for PHP 8.0+). Apply via cPanel > PHP Selector > PHP Options or edit php.ini in public_html. Verify: create phpinfo.php and check OPcache section. Available on Connect Quest hosting at connectquest.co.in.

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