React Server Components, On-Demand Tag Revalidation & Sub-1.0s Largest Contentful Paint
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The single most common mistake in Next.js App Router codebases is placing 'use client' at the top of page layouts, which turns the entire subtree into client-side JavaScript. To achieve sub-second load times, push 'use client' directives as far down the component tree as possible (to interactive buttons and forms), keeping layout wrappers, data fetching, and heavy markdown parsers strictly on the server.
Leverage Next.js's multi-layered caching system: Request Memoization, Data Cache, Full Route Cache, and Router Cache. For dynamic e-commerce or SaaS dashboards, utilize `unstable_cache` with tagged cache keys (e.g. `revalidateTag('products-list')`) to serve instantaneous static HTML to users while invalidating data on-demand when mutations occur.
CLS degrades user experience and search rankings. Fix CLS by specifying explicit aspect ratio CSS containers for hero banners, reserving skeleton placeholder dimensions for streaming Suspense boundaries, and utilizing next/font to eliminate Flash of Unstyled Text (FOUT).
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