Find long tasks and associate them with script, route and interaction timing.
Browser overlay (MV3 extension + bookmarklet) that highlights the LCP element, render-blocking resources, and long tasks on any page, with a fix tip and deep-link for each finding. Docs on frontend-performance.com.
Context budget skill: graduated file reads (head, section, search), a working notes file that survives compaction, and three-line checkpoints at phase boundaries — long tasks finish on notes, not fumes.
Main-thread lag monitoring for browser apps: event loop lag, long tasks, Long Animation Frames, hangs, INP and Web Vitals from real users, as OpenTelemetry metrics, events and traces.
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