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Mostly it takes you from thinking 50 requests per second is pretty good to being annoyed that you are only pushing 10,000 per second. It also tends to fail a whole lot less.

And hosting it for free at Github.

It also drastically lowers the amount of processing overhead per page served, after all, there's no dynamic code to process nor are there any database queries to execute.

I guess being able to use layouts that get "baked" into each of the final static HTML files would be handy.

They all do that.