"Rendering performance in web applications is often limited by server work that cannot be completed instantly. Data fetching, personalization, and backend aggregation all take time. In many applications, this work blocks the entire page, leaving users with a blank screen until everything finishes. Next.js has traditionally handled this through a static-by-default model. A route is either static or dynamic, and that decision applies to the entire page. This works well for simple cases, but it becomes restrictive as applications grow."
"A quick look at Partial Pre-Rendering (PPR) Modern pages rarely deal with just one kind of data. Navigation and layout are often predictable, catalog or content data changes occasionally, and personalization or session data must be computed on every request. When all of this work is handled in a single render pass, the slowest operation determines when anything can be shown."
Server-side work such as data fetching, personalization, and backend aggregation can delay page rendering and leave users staring at a blank screen. Next.js historically used a static-by-default model where a route is either static or dynamic for the whole page, which forces mixed-content pages into a single rendering mode. Partial Pre-Rendering allows a static page shell to be sent immediately while slower, request-specific sections are deferred. Cache Components in Next.js 16 enable component-level caching and reuse on top of Partial Pre-Rendering, letting predictable parts be reused without blocking dynamic sections. Cache Components give developers control over which components can be cached and reused, improving perceived performance and enabling static and dynamic content to coexist on the same page.
Read at LogRocket Blog
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