React Best Practices

Part of Agent Skills™ by googleadsagent.ai™

Description

React Best Practices codifies 40+ rules across 8 priority categories, from Critical (eliminating waterfalls, reducing bundle size) to Low-Medium (JavaScript micro-optimizations). Each rule is actionable, includes a severity rating, and provides before/after code examples. The agent applies these rules automatically when writing or reviewing React code.

The rules are ordered by impact, not by ease of implementation. Eliminating client-server waterfalls and reducing bundle size yield the largest performance gains and therefore receive Critical priority. Server-side rendering performance and client data fetching patterns follow. Re-render optimization—often the first thing developers reach for—is rated Medium because it rarely causes measurable user-facing performance problems compared to network and bundle issues.

This skill treats React performance as a system property, not a component property. The highest-impact optimizations happen at the architecture level: where data is fetched, how bundles are split, and which rendering strategy is chosen. Component-level optimizations (memoization, key stability) are included but correctly deprioritized.

Use When

• Writing new React components or pages
• Reviewing React code for performance issues
• Debugging slow page loads or sluggish interactions
• Optimizing Core Web Vitals (LCP, FID, CLS)
• Migrating from client-side to server-side rendering