React Streaming SSR Without Server Components — A Practical Guide

React Server Components get all the attention for streaming SSR. But RSC isn't the only way — and for many apps, it's more complexity than you need. You can stream HTML from the server using renderToPipeableStream , defer() , and standard Suspense — no server components, no "use client" directives, no mental gymnastics about which component runs where. This post shows how, using Pareto as the framework. What streaming SSR actually means Traditional SSR works like this: Request comes in Server fetches all data Server renders complete HTML Browser receives the full page The problem: if any data source is slow, the entire page is slow. A 200ms database query + a 2s external API call = every user waits 2+ seconds for first paint. Streaming SSR works differently: Request comes in Server sends the HTML shell + fast data immediately Slow data streams in as it resolves Browser progressively renders each section Users see content in milliseconds. Slow data appears as it becomes available. No fu