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I got 3 seconds.

But that isn't 3 seconds to serve the page. That's 3 seconds to basically build and boot the "server" on-demand, start all necessary daemons and serve the page.

Now think about what happened when you needed to add a Web server 10 years ago.

It is just an example to show how quickly they can provision a new vm+server. They are not advocating for it to be a good way to serve requests.

libvirt is the limit in this case...

Right, it's just example, right, it dies after each request - you can check the code on github. Also, you can review the detailed structure of time spending on the second half of zerg's page.