All 5 Loading UI & Streaming with Suspense questions
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How do you show a loading state automatically while a page's data is being fetched in the App Router? What is streaming in Next.js, and how does it improve the user experience? How do you use multiple Suspense boundaries on the same page to stream different sections independently? How does streaming interact with search engines and SEO, since content is sent in pieces rather than all at once?
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Next.js › Loading UI & Streaming with Suspense

How would you design loading states for a complex page with several independently loading sections to avoid a jarring, jumpy user experience?

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Answer

You design skeleton loading placeholders that closely match the actual size and shape of the content that will eventually appear, use consistent Suspense boundaries so sections load in a predictable order, and avoid excessive layout shift by reserving the correct amount of space for each section before its real content arrives.
function CardSkeleton() {
  return <div className="h-32 w-full animate-pulse bg-gray-200 rounded" />;
}

<Suspense fallback={<CardSkeleton />}>
  <ProductCard />
</Suspense>
Real-world example A product listing page uses skeleton cards that match the exact size of the real product cards, so the page layout does not jump around awkwardly as real content streams in and replaces the placeholders.

Common follow-ups: What tools help measure layout shift caused by streaming content?;How do you test that skeleton screens closely match final content sizes?

Web Vitals & Performance Monitoring;Rendering (SSR/SSG/ISR)
All 5 Loading UI & Streaming with Suspense questions