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Next.js 15 Fullstack (App Router + Server Actions) · Lesson

Streaming UI with Suspense & Loading States

Improve perceived performance by streaming server-rendered UI with React Suspense, loading.tsx files, and skeletons so users see content sooner.

The Waterfall Problem

If a page waits for every data fetch before rendering, users stare at a blank screen. Streaming lets the server send ready parts of the page immediately and fill in slow parts as they finish.

What is Streaming SSR?

Next.js with the App Router can stream HTML in chunks. The shell and fast components arrive first; slow data-dependent sections stream in when ready, improving Time to First Byte and perceived speed.

All lessons in this course

  1. Image & Font Optimization
  2. Bundle Size Analysis
  3. Advanced Caching Strategies
  4. Streaming UI with Suspense & Loading States
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