Next.js App Router Performance: Practical Optimization Techniques
How Server Components, streaming, and caching can improve user-perceived performance, with results measured for each project.
Rethinking the Client-Server Boundary
React Server Components can keep suitable interface code on the server and reduce the JavaScript sent to browsers, depending on which components need client-side behavior.
Moving suitable data fetching to the server can reduce some client-side request waterfalls and provide rendered HTML earlier, depending on the page's data dependencies and deployment environment.
Optimizing Core Web Vitals (LCP & INP)
To improve Largest Contentful Paint (LCP), prioritize the main image, load critical fonts carefully, and limit third-party scripts. Measure results on representative devices and networks because performance varies by page and environment.
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