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Comprehensive performance optimization guide for React and Next.js applications, maintained by Vercel. Contains 45 rules across 8 categories, prioritized by impact to guide automated refactoring and code generation.

Redis-compatible cache for Next.js with TTL support, rate limiting, and session management via Vercel KV and Upstash. \n \n Supports core Redis operations: strings, hashes, sorted sets, lists, and pipelines for batch commands with automatic performance optimization \n Built-in TTL management prevents memory leaks; use setex() for temporary data and namespaced keys ( user:123 , ratelimit:ip:endpoint ) to avoid collisions \n Common patterns include cache-aside retrieval, atomic rate limiting with

Secure file uploads and CDN delivery for Next.js with presigned tokens and multipart support. \n \n Supports server-side uploads via put() and client-side uploads with presigned tokens via handleUpload() to avoid exposing credentials \n Handles files up to 500MB with automatic multipart upload; client uploads bypass the 4.5MB serverless function limit \n Includes file listing with cursor-based pagination, deletion, and content-type management for proper browser handling \n Prevents 16 documented

Deploy any project to Vercel instantly. No authentication required.

Serverless Postgres setup for edge functions with connection pooling, branching, and ORM integration. \n \n Supports Neon Direct (multi-cloud, Cloudflare Workers) and Vercel Postgres (zero-config on Vercel); both use HTTP/WebSocket protocols instead of TCP for edge compatibility \n Requires pooled connection strings ( -pooler. in hostname) for serverless; non-pooled connections exhaust quickly in high-concurrency environments \n Template tag syntax ( sql`...` ) prevents SQL injection; string con

Deploy applications to Vercel as preview or production environments. \n \n Supports both Vercel CLI and fallback script-based deployment methods, with automatic framework detection and packaging \n Always deploys as preview by default unless user explicitly requests production deployment \n Returns preview URL immediately and claim URL for fallback deployments to manage the deployment \n Requires 10-minute timeout for build completion; escalates network permissions only if sandbox blocks outboun

Instant deployment to Vercel with auto-detected frameworks and no authentication required. \n \n Packages projects into tarballs, auto-detects frameworks from package.json , and returns a live preview URL plus a claimable deployment link for account transfer \n Supports 20+ frameworks across React, Vue, Svelte, backend runtimes, and static HTML projects \n Excludes node_modules and .git from deployments to minimize package size \n Returns both human-readable URLs and JSON output for programmatic

45 performance optimization rules for React and Next.js, organized by impact from critical waterfalls and bundle size down to advanced patterns. \n \n Covers 8 rule categories prioritized by performance impact: eliminating waterfalls, bundle optimization, server-side performance, client-side data fetching, re-render optimization, rendering performance, JavaScript performance, and advanced patterns \n Each rule includes explanations, incorrect/correct code examples, and context to guide automated