perf-guard

【开发与工程】Measure REAL web performance with a budget and regression diff — runs Lighthouse CLI (mobile + desktop) or PageSpeed Insights API against a production URL, checks metrics against a perf-budget, and diffs runs. Never trusts chrome-devtools MCP traces (falsely optimistic). Use when user says "замерь перформанс", "проверь скорость сайта", "lighthouse", …

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