---
id: vercel-react-best-practices
name: "vercel-react-best-practices"
url: https://skills.yangsir.net/skill/vercel-react-best-practices
author: vercel-labs
domain: ai-frontend-engineering
tags: ["react", "next-js", "web-development", "performance-optimization"]
install_count: 419700
rating: 4.90 (2000 reviews)
github: https://github.com/vercel-labs/agent-skills
---

# vercel-react-best-practices

> Vercel维护的React和Next.js应用性能优化指南，包含8大类62条规则，帮助开发者构建高性能前端应用。

**Stats**: 419,700 installs · 4.9/5 (2000 reviews)

## Before / After 对比

### React/Next.js应用性能优化实践对比

## Readme

# vercel-react-best-practices

# Vercel React Best Practices

Comprehensive performance optimization guide for React and Next.js applications, maintained by Vercel. Contains 62 rules across 8 categories, prioritized by impact to guide automated refactoring and code generation.

## When to Apply

Reference these guidelines when:

- Writing new React components or Next.js pages

- Implementing data fetching (client or server-side)

- Reviewing code for performance issues

- Refactoring existing React/Next.js code

- Optimizing bundle size or load times

## Rule Categories by Priority

Priority
Category
Impact
Prefix

1
Eliminating Waterfalls
CRITICAL
`async-`

2
Bundle Size Optimization
CRITICAL
`bundle-`

3
Server-Side Performance
HIGH
`server-`

4
Client-Side Data Fetching
MEDIUM-HIGH
`client-`

5
Re-render Optimization
MEDIUM
`rerender-`

6
Rendering Performance
MEDIUM
`rendering-`

7
JavaScript Performance
LOW-MEDIUM
`js-`

8
Advanced Patterns
LOW
`advanced-`

## Quick Reference

### 1. Eliminating Waterfalls (CRITICAL)

- `async-defer-await` - Move await into branches where actually used

- `async-parallel` - Use Promise.all() for independent operations

- `async-dependencies` - Use better-all for partial dependencies

- `async-api-routes` - Start promises early, await late in API routes

- `async-suspense-boundaries` - Use Suspense to stream content

### 2. Bundle Size Optimization (CRITICAL)

- `bundle-barrel-imports` - Import directly, avoid barrel files

- `bundle-dynamic-imports` - Use next/dynamic for heavy components

- `bundle-defer-third-party` - Load analytics/logging after hydration

- `bundle-conditional` - Load modules only when feature is activated

- `bundle-preload` - Preload on hover/focus for perceived speed

### 3. Server-Side Performance (HIGH)

- `server-auth-actions` - Authenticate server actions like API routes

- `server-cache-react` - Use React.cache() for per-request deduplication

- `server-cache-lru` - Use LRU cache for cross-request caching

- `server-dedup-props` - Avoid duplicate serialization in RSC props

- `server-hoist-static-io` - Hoist static I/O (fonts, logos) to module level

- `server-serialization` - Minimize data passed to client components

- `server-parallel-fetching` - Restructure components to parallelize fetches

- `server-after-nonblocking` - Use after() for non-blocking operations

### 4. Client-Side Data Fetching (MEDIUM-HIGH)

- `client-swr-dedup` - Use SWR for automatic request deduplication

- `client-event-listeners` - Deduplicate global event listeners

- `client-passive-event-listeners` - Use passive listeners for scroll

- `client-localstorage-schema` - Version and minimize localStorage data

### 5. Re-render Optimization (MEDIUM)

- `rerender-defer-reads` - Don't subscribe to state only used in callbacks

- `rerender-memo` - Extract expensive work into memoized components

- `rerender-memo-with-default-value` - Hoist default non-primitive props

- `rerender-dependencies` - Use primitive dependencies in effects

- `rerender-derived-state` - Subscribe to derived booleans, not raw values

- `rerender-derived-state-no-effect` - Derive state during render, not effects

- `rerender-functional-setstate` - Use functional setState for stable callbacks

- `rerender-lazy-state-init` - Pass function to useState for expensive values

- `rerender-simple-expression-in-memo` - Avoid memo for simple primitives

- `rerender-move-effect-to-event` - Put interaction logic in event handlers

- `rerender-transitions` - Use startTransition for non-urgent updates

- `rerender-use-ref-transient-values` - Use refs for transient frequent values

- `rerender-no-inline-components` - Don't define components inside components

### 6. Rendering Performance (MEDIUM)

- `rendering-animate-svg-wrapper` - Animate div wrapper, not SVG element

- `rendering-content-visibility` - Use content-visibility for long lists

- `rendering-hoist-jsx` - Extract static JSX outside components

- `rendering-svg-precision` - Reduce SVG coordinate precision

- `rendering-hydration-no-flicker` - Use inline script for client-only data

- `rendering-hydration-suppress-warning` - Suppress expected mismatches

- `rendering-activity` - Use Activity component for show/hide

- `rendering-conditional-render` - Use ternary, not && for conditionals

- `rendering-usetransition-loading` - Prefer useTransition for loading state

- `rendering-resource-hints` - Use React DOM resource hints for preloading

- `rendering-script-defer-async` - Use defer or async on script tags

### 7. JavaScript Performance (LOW-MEDIUM)

- `js-batch-dom-css` - Group CSS changes via classes or cssText

- `js-index-maps` - Build Map for repeated lookups

- `js-cache-property-access` - Cache object properties in loops

- `js-cache-function-results` - Cache function results in module-level Map

- `js-cache-storage` - Cache localStorage/sessionStorage reads

- `js-combine-iterations` - Combine multiple filter/map into one loop

- `js-length-check-first` - Check array length before expensive comparison

- `js-early-exit` - Return early from functions

- `js-hoist-regexp` - Hoist RegExp creation outside loops

- `js-min-max-loop` - Use loop for min/max instead of sort

- `js-set-map-lookups` - Use Set/Map for O(1) lookups

- `js-tosorted-immutable` - Use toSorted() for immutability

- `js-flatmap-filter` - Use flatMap to map and filter in one pass

### 8. Advanced Patterns (LOW)

- `advanced-event-handler-refs` - Store event handlers in refs

- `advanced-init-once` - Initialize app once per app load

- `advanced-use-latest` - useLatest for stable callback refs

## How to Use

Read individual rule files for detailed explanations and code examples:

```
rules/async-parallel.md
rules/bundle-barrel-imports.md

```

Each rule file contains:

- Brief explanation of why it matters

- Incorrect code example with explanation

- Correct code example with explanation

- Additional context and references

## Full Compiled Document

For the complete guide with all rules expanded: `AGENTS.md`
Weekly Installs222.6KRepository[vercel-labs/agent-skills](https://github.com/vercel-labs/agent-skills)GitHub Stars23.2KFirst SeenJan 19, 2026Security Audits[Gen Agent Trust HubPass](/vercel-labs/agent-skills/vercel-react-best-practices/security/agent-trust-hub)[SocketPass](/vercel-labs/agent-skills/vercel-react-best-practices/security/socket)[SnykPass](/vercel-labs/agent-skills/vercel-react-best-practices/security/snyk)Installed onopencode158.8Kgemini-cli156.3Kcodex155.5Kgithub-copilot145.4Kcursor139.4Kclaude-code127.1K

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