How Next.js Streaming and React Suspense Fix Slow Server-Side Rendering

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Traditional Server-Side Rendering in Next.js forced the server to wait for all data fetches to complete before sending any HTML to the browser, causing users to see a blank screen until the slowest request finished. This blocking behavior hurt Core Web Vitals, particularly Time to First Byte. Next.js App Router addresses this with HTTP Streaming, which sends static UI elements immediately while slow data queries run in the background. React Suspense acts as a declarative boundary that tells the server where to split the UI, allowing placeholders like skeletons to appear instantly in place of slow components. Once a heavy query resolves, the server streams the final HTML chunk and replaces the placeholder seamlessly, without blocking the rest of the page.

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