The Web Performance Optimization skill helps developers measure, analyze, and improve website and web application performance to enhance user experience, S…
The Web Performance Optimization skill helps developers measure, analyze, and improve website and web application performance to enhance user experience, SEO, and conversions. It guides running automated and field audits (Lighthouse, Core Web Vitals, RUM), inspecting bundle sizes and network waterfalls, and pinpointing issues such as large JavaScript bundles, render-blocking resources, layout shifts, and slow server responses. The skill recommends prioritized actions — critical rendering path optimization, code-splitting and lazy loading, image and font optimization, caching headers, and third-party script management — and provides implementation steps for asset optimization and caching strategies. It also validates results with before/after Lighthouse reports, real-user metrics, cross-device and network testing, and ongoing monitoring. Use this skill when improving LCP, FID/INP, CLS, TTI, reducing payloads, or preparing for performance audits.
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