performance-profiling

From the author

Find where the time actually goes before changing anything — define the metric and workload, build a repeatable baseline with its spread, profile on the right axis, confirm the suspected hotspot by removing its work, then re-measure under identical conditions. Use when something is slow, when an optimization is about to be written from a hunch, or when a speedup is being claimed without comparable numbers. Not for reading code to guess what is expensive, not for micro-tuning with no measured user impact, and not a licence to profile production without asking.