Architecture

Next.js 16 is less about flashy new APIs and more about the framework growing up: a faster default bundler, a clearer caching story, and some deliberate renames that make the mental model honest. Here's what actually matters when you upgrade.

• Next.js
• React
• Performance

The App Router makes every component a Server Component by default, and 'use client' opts into the browser. Getting the boundary right is the single biggest lever you have over bundle size and interactivity — here's how to reason about it.

• React
• Next.js
• Architecture