performance-profiling

Guides measure-first performance investigation using CPU profilers, memory analyzers, flamegraphs, and reproducible benchmarking across Python and Node.js. USE WHEN the user asks to "profile this code", "find the bottleneck", "create a flamegraph", "benchmark this function", "find memory leaks", "check memory usage", "reduce latency", or "measure execution time", or works with cProfile, py-spy, scalene, clinic.js, Chrome DevTools, hyperfine, or pytest-benchmark. DO NOT USE for security auditing, dependency management, or code refactoring.