perf-preload

Generate static preload <link> tags for a page's LCP with the perf-preload CLI (adobecom/perf-tools). Records a production page several times through perf-ab (always real Lighthouse 13.6.0, mobile profile with real DevTools throttling; by default on a verified-US GitHub Actions runner, or locally with --local; every load cold with a fresh Chrome and empty profile, no warm-ups), finds the LCP element in each trace and the scripts, stylesheets, fonts, GET JSON/HTML data fetches and LCP image that finished loading before it, and writes a head.html snippet of <link rel="modulepreload|preload"> tags. Then validates the snippet with perf-ab. Also analyzes DevTools trace JSON files attached by the user. Use when asked to "generate preloads", "what should be preloaded for LCP", "find the LCP critical resources", "build a preload list / head.html snippet", or "why is LCP late on this page".