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Optimizing Next.js 14 for 100/100 Core Web Vitals

Google's Core Web Vitals directly dictate search engine ranking and user conversion rates. Achieving a 100/100 Lighthouse score on Next.js 14 requires mastering App Router Server Components, streaming SSR, and asset optimization.

1. Leveraging React Server Components (RSC)

In Next.js 14, components are Server Components by default. Moving heavy library dependencies (such as Markdown parsers, date formatters, or database connectors) to the server reduces client JavaScript bundle sizes by up to 70%.

2. Streaming SSR with React Suspense

Avoid blocking page renders for slow API requests. Wrap dynamic data sections in Suspense boundaries so critical layout shell components render instantly for Largest Contentful Paint (LCP):

import { Suspense } from 'react';
import { ProductSkeleton, ProductList } from '@/components';

export default function CatalogPage() {
  return (
    <main class="catalog">
      <h1>Our Digital Products</h1>
      <Suspense fallback={<ProductSkeleton />}>
        <ProductList />
      </Suspense>
    </main>
  );
}

3. Image & Font Optimization Tokens

Use next/image with AVIF format support and explicit width/height ratios to prevent Cumulative Layout Shifts (CLS). Pair with next/font for zero-runtime font rendering.

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