PHP performance optimization spans OPcache (caching compiled code — the single biggest win), the JIT compiler (PHP 8), efficient code, caching data, and database optimization. Modern PHP 8.x is dramatically faster than older versions, and proper configuration matters.
OPcache — the essential optimization
Without OPcache: PHP RE-COMPILES every .php file to bytecode on EVERY request (slow!).
With OPcache: compiled bytecode is CACHED in memory → subsequent requests skip
compilation entirely → often 2-3x faster. ALWAYS enable it in production.
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