Performance Audit Skill

Goal

Identify performance bottlenecks through measurement (never guessing), propose evidence-based optimizations, and verify improvements with benchmarks. Performance changes must not introduce regressions.

Steps

1. Establish performance baseline (always measure before optimizing)

   # API endpoint load testing
   npx autocannon -c 100 -d 30 http://localhost:3000/api/users
   
   # Node.js profiling
   node --prof src/server.js
   node --prof-process isolate-*.log > profile.txt
   
   # PHP profiling with Blackfire
   blackfire curl http://localhost:8000/api/endpoint