Static export option in NextJS - Performance & Optimization

Performance: Static export option

HIGH IMPACT

This affects the page load speed by pre-generating HTML at build time, reducing server work and improving initial content display.

Delivering fast initial page load for mostly static content

NextJS

export async function getStaticProps() {
  const res = await fetch('https://example.com/api/data');
  const data = await res.json();
  return { props: { data } };
}

export default function Page({ data }) {
  return <div>{data.content}</div>;
}

Pre-fetching data at build time generates static HTML, so page loads instantly without client fetch.

📈 Performance GainImproves LCP by eliminating client fetch delay; content is ready on first paint.

Delivering fast initial page load for mostly static content

NextJS

export default function Page() {
  const [data, setData] = React.useState(null);
  React.useEffect(() => {
    fetch('/api/data').then(res => res.json()).then(setData);
  }, []);
  if (!data) return <p>Loading...</p>;
  return <div>{data.content}</div>;
}

Fetching data on the client delays content rendering and increases time to first meaningful paint.

📉 Performance CostBlocks LCP until client fetch completes; adds network delay on every page load.

Performance Comparison

Pattern	DOM Operations	Reflows	Paint Cost	Verdict
Client-side data fetch	Minimal initially, but updates DOM after fetch	Triggers at least 1 reflow after data arrives	Paint delayed until data fetch completes	[X] Bad
Static export with getStaticProps	Full DOM ready on load	No reflows caused by data fetching	Paint happens immediately with full content	[OK] Good

Rendering Pipeline

Static export pre-renders HTML and CSS during build, so browser receives fully formed content, skipping server rendering and client data fetching.

→HTML Generation

→Network Transfer

→First Paint

⚠️ BottleneckNetwork Transfer and First Paint if content is fetched client-side

Core Web Vital Affected

LCP

This affects the page load speed by pre-generating HTML at build time, reducing server work and improving initial content display.

Optimization Tips

1Pre-build pages with getStaticProps to serve ready HTML and speed up LCP.

2Avoid client-side data fetching for main content to reduce delays and reflows.

3Use static export for mostly static sites to minimize server load and improve user experience.

Performance Quiz - 3 Questions

How does using Next.js static export affect Largest Contentful Paint (LCP)?

A It improves LCP by serving pre-built HTML with content ready to display.

B It worsens LCP by adding extra server processing on each request.

C It has no effect on LCP because content is fetched client-side.

D It delays LCP due to additional JavaScript parsing.

DevTools: Performance

How to check: Record page load and look for time to first contentful paint and network requests; check if main content appears immediately or after fetch.

What to look for: Short time to first contentful paint and absence of delayed data fetch network calls indicate good static export performance.