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Ok so it is a static site generator. Wasn't really obvious from the landing page.

Doesn't almost every large front end framework have a static site generator? I think Vue for example has it built in for example.

Why would anyone use this over the already existing one in their current ecosystem?

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I can't speak for every frameworks' SSG tool but most of them load a full SPA on the client and have poor performance. Go pick out a random website for Gatsby's showcase page and see how much JS is loaded (spoiler: a lot).

Astro focuses on partial hydration where you only load the JS for the specific components that need to run in the client. Very few tools and none of the framework SSG's that I'm aware of do this.

There's also a variety of other features that Astro brings, the blog post talks about them.

Ok well it seems kind of cool, maybe I'll try it out. :)

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