Web Performance Operations

Verified against web.dev + Chrome docs (2026-10-05). Every threshold below lives once in assets/web-perf-facts.json. scripts/check-web-perf-facts.py --offline fails if this table and the catalog disagree, and --live (weekly) fails if Google moves a number.

Diagnose and fix frontend page speed the way Core Web Vitals are judged: field data decides whether there is a problem, lab data explains it, and each fix targets the failing metric's dominant subpart, not "the score". Server-side profiling, load testing and backend latency belong to perf-ops; this skill takes over once the question is about what a browser experiences.

The method