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A self-hosted Next.js app becomes much more interesting when it is not limited to normal request-response pages.

With your own server, you decide how the app runs. You can run long-lived processes, custom APIs, workers, WebSockets, Redis, cron jobs, and multiple apps together.

In Next.js, this matters a lot because smaller bundles mean faster page loads, less JavaScript parsing, better Core Web Vitals, and a smoother experience on slower devices.