Agent skill
nextjs15-performance
Next.js 15 critical performance fixes. Use when writing React components, data fetching, Server Actions, or optimizing bundle size.
Install this agent skill to your Project
npx add-skill https://github.com/majiayu000/claude-skill-registry/tree/main/skills/data/nextjs-performance
SKILL.md
Before writing Next.js code
- Read
docs/agent/architecture/nextjs-critical-fixes.mdfor full patterns - Check existing components in
apps/frontend/components/for examples
Critical Rules (always apply)
Waterfalls
- Use
Promise.all()for independent fetches - Wrap slow data in
<Suspense>boundaries - Defer
awaitinto branches where needed
Bundle Size
- NO barrel imports:
import X from 'lucide-react'❌ - YES direct imports:
import X from 'lucide-react/dist/esm/icons/x'✅ - Use
next/dynamicfor heavy components (editors, charts, PDF viewers) - Defer analytics with
ssr: false
Server Actions
- ALWAYS check auth INSIDE the action, not just middleware
- Verify resource ownership before mutations
Production Build
- Users run
npm run build && npm run start, NOTnpm run dev - Docker must use standalone output, not dev mode
Quick Check Before PR
[ ] No sequential awaits for independent data
[ ] Icons imported directly
[ ] Heavy components use next/dynamic
[ ] Server Actions have auth inside
[ ] Suspense around slow fetches
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