nextjs15-performance
PopulaireNext.js 15 critical performance fixes. Use when writing React components, data fetching, Server Actions, or optimizing bundle size.
Next.js 15 critical performance fixes. Use when writing React components, data fetching, Server Actions, or optimizing bundle size.
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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