Vercel just dropped the best react practices that you and your agent need

Описание: Are you optimizing the wrong things in your React and Next.js apps? Most performance work is *reactive**—we wait for the app to feel slow before chasing symptoms. In this video, we dive into the "React Best Practices" guide by Vercel Engineering, a comprehensive framework containing **40+ rules* designed to eliminate "performance killers" once and for all.

We break down the 8 key categories of performance, prioritized by their actual impact on your users:

🚀 *CRITICAL: Eliminating Waterfalls* – Why sequential awaits are the #1 performance killer and how to parallelize them.
📦 *CRITICAL: Bundle Size Optimization* – The hidden cost of "barrel files" (which can add 200-800ms of import time!) and how to use dynamic imports.
🖥️ *HIGH: Server-Side Performance* – Mastering React.cache(), LRU caching, and minimizing serialization at RSC boundaries.
🔄 *MEDIUM: Re-render & Rendering Optimization* – Using functional setState updates, transitions, and the CSS `content-visibility` property for long lists.
🛠️ *LOW-MEDIUM: JavaScript Micro-optimizations* – Effective use of Maps for O(1) lookups and early returns in functions.

This guide wasn't just built for humans—it’s optimized for *AI agents and LLMs* to follow when refactoring code. Whether you are a solo dev or part of a large team, these practices are derived from 10+ years of production experience to help you ship faster, smoother applications.

*Key Links mentioned in the sources:*
*React Best Practices Repository:*
*SWR for Data Fetching:* https:// swr.vercel.app
*Next.js Documentation:* https:/ /nextjs.org

#ReactJS #NextJS #WebPerformance #Vercel #SoftwareEngineering #CodingTips