What problem does it solve? React and Next.js codebases often suffer from slow load times, unnecessary re-renders, and bloated bundles because developers miss subtle performance pitfalls. This Skill provides a structured, prioritized rule set from Vercel Engineering so AI agents and developers consistently apply proven optimization patterns during code generation and review. ## Core Features & Use Cases - 70 Prioritized Rules Across 8 Categories: Covers eliminating async waterfalls, bundle size optimization, server-side performance, client-side data fetching, re-render optimization, rendering performance, JavaScript micro-optimizations, and advanced patterns, each tagged by impact level from CRITICAL to LOW. - Incorrect vs. Correct Code Examples: Every rule includes concrete TypeScript/TSX examples showing the anti-pattern and the optimized implementation, plus impact metrics like 2-10x improvements or 200-800ms import cost savings. - Use Case: When refactoring a Next.js page that fetches user, posts, and comments sequentially, apply the async-parallel rule to rewrite the fetches with Promise.all(), cutting three network round trips down to one. ## Quick Start Review my Next.js page component and apply the Vercel React best practices rules to eliminate data fetching waterfalls and reduce bundle size.
