Skills · SkillWeb & UIDevOps & CloudReviewed

react-performance

React and Next.js performance optimization patterns adapted from Vercel Engineering's React Best Practices (https://github.com/vercel-labs/agent-skills). Organizes 70+ rules across 8 priority categories — waterfalls, bundle size, server-side, client fetching, re-render, rendering, JS micro-perf, advanced.

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Kind: Skill
Works with: Claude Code, Codex
Languages: TypeScript / JavaScript
Source: affaan-m/ECC @ d3b8a3e90890
Path: skills/react-performance/SKILL.md
License: MIT
Jobs: Implementation, Review, Documentation

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# React Performance

Performance optimization patterns for React 18/19 and Next.js, adapted from [Vercel Labs `react-best-practices`](https://github.com/vercel-labs/agent-skills/tree/main/skills/react-best-practices) (MIT, v1.0.0). This skill organizes rules by priority and provides decision-tree guidance for active code review and refactoring.

## When to Activate

- Writing or reviewing React/Next.js code for performance
- Diagnosing slow page loads, slow interactions, or high CPU on the client
- Auditing bundle size or Lighthouse Core Web Vitals regressions
- Removing waterfalls in Server Components / API routes
- Reducing client-side re-renders
- Optimizing long lists, animations, or hydration
- Auditing optimization choices in PRs touching `app/`, `pages/`, `components/`, or data layers

## Priority Index

| Priority | Category | Prefix | When it matters |
|---|---|---|---|
| 1 — CRITICAL | Eliminating Waterfalls | `async-` | Anytime `await` is followed by independent `await` |
| 2 — CRITICAL | Bundle Size Optimization | `bundle-` | First-load JS, route-level imports, third-party libs |
| 3 — HIGH | Server-Side Performance | `server-` | RSC, Server Actions, API routes, SSR |
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