Streaming responses from the server

Without streaming, the server has to wait until every bit of data is ready before it can send a single byte. With streaming, it sends the HTML as soon as each piece is ready, and the browser paints progressively. Suspense is what tells React which parts can stream and which parts have to wait.

Streaming directly improves time to first byte. The server can send the header, the nav, and any skeletons immediately, even if the main content is still loading. For pages that mix fast data (the user profile) with slow data (a complex query), this feels like a completely different app.