Performance

Core Web Vitals (LCP, CLS, INP) and other performance signals. smartspec calls PageSpeed Insights when an API key is configured; otherwise it falls back to HTML-derived hints.

Source module: performance.ts

Rules in this category are populated from the live PageSpeed result, so specific rule IDs vary per run. Expect rules around LCP, CLS, and INP thresholds, plus HTML-level hints like missing loading="lazy" on images below the fold.

Run just this category

smartspec audit https://example.com --categories performance