next-forge
Explore Next.js 15 major updates: Turbopack as default bundler, revamped caching defaults, React 19 support with use() API, and stable Server Actions. Complete migration guide included.
Next.js 15 marks a significant milestone for the React full-stack framework, delivering comprehensive performance improvements and a better developer experience.
The most notable change is Turbopack becoming the default bundler, reducing local dev startup time by up to 76% and making Hot Module Replacement (HMR) significantly faster.
On the caching front, Next.js 15 changes fetch requests, GET route handlers, and client-side router navigation to be uncached by default, making caching behavior more intuitive and explicit.
React 19 concurrent features—including the use() API and stable Server Actions—are fully supported in Next.js 15, allowing developers to leverage the latest React capabilities out of the box.
If you are upgrading from Next.js 14, run the official codemod tool first, then gradually adjust your caching configuration for a smooth migration.