The "boots up our application within a second on a Raspberry Pi" comment in the FAQ[0] is actually about my development setup, as I don't own a fancy computer myself. It was mainly meant to illustrate the fast startup time of the Janet[1] language. In fact, that startup time is so fast, you can run your app as a CGI script. That has some more possible advantages, see the FAQ for more details.
[0] FAQ: https://withoutdistractions.com/cv/faq#technology
[1] Janet: https://janet-lang.org/