Next.js 15 ships with full React Server Components support, making it trivial to stream UI, defer data fetches, and keep your bundle lean. In this post we walk through the features that matter most for production teams: Partial Prerendering (PPR), the stable App Router, and the new caching model that replaces the old ISR knobs.
Partial Prerendering
PPR lets you ship a static shell instantly while async components stream in behind it. You get the best of static and dynamic on the same page — no layout shift, no full-page spinner.
The new caching model
Next.js 15 moves away from implicit ISR and gives you explicit revalidate tags. Cache invalidation is now a first-class operation you call from server actions or API routes, making stale data a deliberate choice rather than an accident.
For teams shipping e-commerce, SaaS dashboards, or content-heavy sites, the upgrade path from Next.js 14 is straightforward. We have migrated four client projects this quarter — average migration time: two days.