A checklist of 50+ React performance and composition patterns ranked by impact, focused on React 19 + Vite + Cloudflare stacks. It's organized around what actually slows apps down: waterfalls, bundle bloat, bad composition, unnecessary re-renders. The tables are terse and scannable, showing problem code next to fixes. Use it during code review or when something feels slow and you need a systematic audit. The critical section on eliminating waterfalls alone (parallel fetches, hoisting data, collapsing Suspense boundaries) will catch most production performance issues. Strong opinions on composition over boolean props and when to actually worry about re-renders versus when to ignore them.
npx skills add https://github.com/jezweb/claude-skills --skill react-patterns