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Astro’s “hybrid” rendering originally meant a static-first site with selected pages rendered on the server. Since Astro 5, output: 'hybrid' is no longer a separate output setting: Astro merged the former hybrid and static configurations into static. The current decision is whether a route can be generated ahead of time or needs request-time rendering—and whether dynamic behavior belongs to a whole route or a single component.
What did Astro hybrid rendering mean?
In Astro 4, output: 'hybrid' described “Building a static site with a few server-side rendered pages,” according to Astro’s version 4 rendering modes guide. Most pages could be built as static files, while selected routes could run on the server when a request arrived. That blend is the historical meaning of “Astro hybrid rendering.”
Astro described the same architectural idea when introducing the mode: mix static and server-rendered pages. Its Astro 5.0 announcement explains that the configuration model was later simplified.
What changed in Astro 5?
Astro 5 merged the former hybrid and static output configurations into one static configuration. Astro’s v5 upgrade guide says the static configuration now works like the prior hybrid option. So, when reading older examples, treat output: 'hybrid' as version-specific terminology—not as a distinct current output choice.
The architectural idea remains useful: pre-render what can be generated in advance and render selected routes on demand where the request matters. Be precise about the Astro version when describing configuration, because the old label and current configuration model are not interchangeable.
How should you choose a rendering approach now?
Astro’s static rendering is the default starting point. Decide route by route whether content can be generated ahead of time or depends on information available only when a request arrives, such as request-time data or personalization. If most routes need that behavior, a server-first setup may fit better; if only a few do, keep the rest pre-rendered and make those routes on-demand.
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- Mostly stable content: pre-render pages that do not need request-time behavior.
- A few request-dependent routes: opt those routes into on-demand rendering rather than making every page server-rendered.
- Request-time behavior across most of the site: consider a server-first output configuration.
- Only one component is dynamic: consider whether a server island can isolate it instead of making the whole route request-dependent.
Astro’s on-demand rendering adapter guide explains the adapter requirement and names Node.js, Vercel, Netlify, and Cloudflare targets. Check the current guide for the Astro version and runtime you deploy to; adapter support and setup details can change.
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Rendering mode concerns how a page or route is produced. Islands describe how interactive or dynamic components fit into that page. Astro’s islands architecture guide describes pages that are mostly HTML, with JavaScript added to components that need browser interaction. Astro puts it this way: “Astro components are the building blocks of your page template. They render to static HTML with no client-side runtime.”
Client islands add browser-side interaction
A client island is an interactive component hydrated in the browser. You choose which components run client-side, rather than treating the entire page as a browser application. This addresses component-level interactivity and when its JavaScript should run; it does not, by itself, make the route server-rendered on demand.
Server islands defer selected server-rendered components
A server island lets an individual server-rendered component be delivered separately while the page shell and fallback content are returned. This can let the main page content be cached more aggressively while a changing or personalized component—such as a visitor-specific avatar or changing e-commerce details—is fetched separately. It is a rendering and caching pattern, not a guarantee of a specific speed improvement.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.Questions to settle before choosing
- Which routes need request-time data, personalization, or other server behavior?
- Can most content be generated ahead of time?
- Does the deployment runtime support the Astro adapter your project needs?
- Is the dynamic behavior a whole-route concern, or can it be isolated in a server island?
- Does a component need browser-side interaction, and when should its JavaScript load?
These questions help match rendering to the job. Astro’s cited documentation does not establish a head-to-head performance winner for static, on-demand, or island-based approaches, so avoid assuming one is universally faster.
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