Learn Performance - Prefetch and Prerender

If you observe the network tab after the navigation, you should notice that the document is fetched instantly from the prefetch cache. Similarly to link rel="prefetch", if the user navigates to the prefetched page before the request has completed, the browser reuses the partially downloaded resource instead of opening a new connection.

In the network panel above, the prefetched document /3-prefetch is fetched instantly from prefetch cache.