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The response headers include

server: cloudflare

You said it though - the reason is that its static without any js/frameworks/SPA round trip requests.

Could be using Cloudflare pages hosted on a R2 bucket: https://pages.cloudflare.com/

Full stack Cloudflare is really fast

There is an nginx server running on debian stable somewhere in the dark heart of Germany. But I do have numerous tricks (too many, probably) to keep things quick.

But there are still ways to be quicker. For example, the header photo is smaller than the vector diagrams on the page, by about tenfold.