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check-performance

Analyze performance-related HTML issues on web pages. Use when users ask to check page performance, audit resource loading, verify lazy loading, check preload hints, or analyze render-blocking resources. Detects missing optimizations, large resources, render-blocking issues, and Core Web Vitals problems.

$ Instalar

git clone https://github.com/leobrival/serum-plugins-official /tmp/serum-plugins-official && cp -r /tmp/serum-plugins-official/plugins/html-checker/skills/check-performance ~/.claude/skills/serum-plugins-official

// tip: Run this command in your terminal to install the skill