Next.js App Router Performance Masterclass: Sub-Second Load Speeds
How to leverage Server Components, dynamic streaming, and granular caching strategies to hit top performance scores on Google Lighthouse.
Rethinking the Client-Server Boundary
With the React Server Component (RSC) paradigm, the default assumption flips: all components render on the server unless explicitly marked with 'use client'. This drastically reduces the client-side JavaScript bundle shipped over the wire.
By pushing data fetching to the server level, we eliminate client-side waterfalls and deliver pre-rendered HTML directly to the browser edge.
Optimizing Core Web Vitals (LCP & INP)
To achieve an LCP (Largest Contentful Paint) under 1.5 seconds, prioritize hero images using next/image with priority flags, preload critical fonts, and remove third-party script bloat during the initial render phase.
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