benchmark

Measures web page performance by collecting real PerformanceAPI data from a running browser session. Captures metric baselines before changes, then compares TTFB, FCP, LCP, bundle sizes, and request counts after. Flags regressions automatically using percentage and absolute thresholds. Instead of manually comparing Lighthouse screenshots or network tab snapshots across branches, it reads live PerformanceAPI entries, diffs them against a saved baseline, and tells you exactly which metric regressed and by how much.