When it comes to building fast and scalable web apps with Next.js, it’s important to understand how rendering works, especially with the App Router. Next.js organizes rendering around two main environments: the server and the client.

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Next.js offers four main rendering strategies that significantly impact Core Web Vitals: Static Rendering provides excellent LCP scores through pre-rendered HTML cached on CDNs; Dynamic Rendering generates fresh content per request for personalized experiences; Streaming progressively renders UI using React Suspense to improve perceived performance; and Client Components enable interactivity while maintaining server-side benefits. Each strategy has specific trade-offs for LCP, INP, and CLS metrics. The article provides practical code examples and recommends hybrid approaches, starting with Server Components as default and adding Client Components only where interactivity is needed.

Next.js Rendering Strategies and how they affect core web vitals