Nextjs · requinlabs bundle Comprehensive performance optimization, Core Web Vitals remediation, Server Actions engineering, and code quality for Next.js (14/15) and React (18/19) applications. Use when asked to optimize React/Next.js performance, eliminate waterfalls, reduce bundle size, fix slow routes, optimize re-renders or hydration, handle Server Actions and mutations, migrate to Next.js 15 async request APIs, improve Core Web Vitals (LCP, INP, CLS), optimize Vercel compute costs and caching, audit web performance budgets, or review UI code against Web Interface Guidelines. Triggers on "optimize Next.js", "React performance", "fix LCP", "reduce CLS", "improve INP", "speed up web", "reduce bundle size", "audit website performance", "Vercel cost optimization", "Next.js 15", "Server Actions", or "review React code".