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Fixes for the performance, configuration and deployment problems Next.js 16 developers hit most, from oversized client bundles and frozen NEXT_PUBLIC_ values to stale caches across pods and "Failed to find Server Action" after a deploy.
How Next.js 16 resolves metadata across segments and streams it, turns metadata files into route handlers, optimizes images on demand, self-hosts fonts at build time, and orders third-party scripts.
Why a parent's re-render re-runs its children, when React.memo, useMemo and useCallback actually help, and how the React Compiler makes the same bailouts fire automatically without making React fine-grained.