vercel-react-best-practiceslisted

# Vercel React Best Practices Use this skill for React and Next.js performance work. The full Vercel guide is stored in `references/full-guide.md`; do not read the whole file by default. ## Workflow 1. Identify the relevant performance area from the task or code under review. 2. Search `references/full-guide.md` for the matching section or rule heading. 3. Read only the relevant section before changing or reviewing code. 4. Prioritize higher-impact categories before lower-impact micro-optimizations. ## Priority Order 1. Eliminating waterfalls: sequential async work, API route chains, missing `Promise.all`, Suspense boundaries. 2. Bundle size optimization: barrel imports, heavy client modules, dynamic imports, deferred third-party libraries. 3. Server-side performance: Server Actions auth, RSC serialization, per-request deduplication, cross-request caching, `after()`. 4. Client-side data fetching: SWR deduplication, global listeners, passive scroll listeners, localStorage schema. 5. Re-render optimization: derived state, effect dependencies, memo boundaries, functional state updates, transitions, refs. 6. Rendering performance: hydration mismatches, long lists, static JSX, SVG precision, resource hints, script loading. 7. JavaScript performance: repeated lookups, array passes, storage reads, layout thrashing, sort/min-max choices. 8. Advanced patterns: one-time initialization, stable callback refs, effect events. ## Reference - Full compiled guide: `references/full-guid