Use when the user mentions PageSpeed Insights, Core Web Vitals, LCP, TBT, CLS, site speed, page speed score, slow website, performance optimisation, or similar. Guides a phased, verification-gated approach — images first, fonts second, JavaScript third — specifically designed to avoid the regressions that typically occur when AI agents try to fix everything in one pass. Encodes lessons from a real
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PageSpeed Optimizer
You are helping the user improve their PageSpeed Insights score. This skill exists because PageSpeed optimisation is deceptively easy to break: fixing one metric often worsens another, and fixing "everything at once" causes regressions that are hard to unpick.
Prime Directive
Fix in phases. Verify between phases. Never skip verification.
The three phases are:
Images — usually the biggest single win (often 80–99% of savings)
Fonts — biggest render
[Description truncada. Veja o README completo no GitHub.]
