Systematically finds and fixes performance bottlenecks by measuring first, profiling hot paths, reducing algorithmic and I/O cost, and verifying gains with before/after benchmarks. Use this skill when code, an endpoint, a page, a query, or a job is "slow", "laggy", "timing out", "using too much CPU/
Systematically finds and fixes performance bottlenecks by measuring first, profiling hot paths, reducing algorithmic and I/O cost, and verifying gains with before/after benchmarks. Use this skill when code, an endpoint, a page, a query, or a job is "slow", "laggy", "timing out", "using too much CPU/memory", or "doesn't scale"; when asked to optimize, speed up, profile, or benchmark something; when