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It also depends on what one runs on it. This website seems to dynamically generate images (3D, maybe?), and send them to clients.

I'll give to this one in particular, but blogs have had the same effect. It's bizarre when commodity hardware is so powerful these days.

It's a 2D monochromatic PNG of the chemical drawing. The body's style links to the background image URL like 'https://www.avogadr.io/api/name/1440/900/38ce5d/caffeine' or 'https://www.avogadr.io/api/name/1440/900/38ce5d/LSD'.

Does making a chemical drawing usually take that much time?

Just because people know how to write for a blog doesn't mean they know how to scale a web server.

I had 10000 concurrent users on a front page blog post once. I think time of day had a big effect.

What day/time did you achieve 10,000 concurrent?