Server Components

If you've read about Fresh's architecture then you know that it's based on the islands architecture pattern. The flip side of this is that everything else is, by default, a server component. When you create a route, all of the components used are rendered on the server. No JavaScript is sent to the client, unless you specifically include something from the /islands/ folder.

Internally, Fresh's rendering heavily leverages preact-render-to-string. This is the exact library mentioned on Preact's Server-Side Rendering article.