Performance Optimization

Diagnose web performance issues and produce a remediation plan. Stack-agnostic. Anchored to Core Web Vitals and standard browser performance patterns.

This skill goes deeper than the performance checks in qa-testing and seo-technical. Use this when performance itself is the goal.

When to use

• Fixing Core Web Vitals (LCP, INP, CLS)
• Diagnosing slow page loads
• Reducing JavaScript bundle size
• Optimizing images, fonts, and other assets
• Fixing layout shift, render-blocking resources, jank
• Pre-launch performance verification
• Annual performance health check

When NOT to use