I've had a few folks ask me how I make https://www.thestopbits.net load so quickly.
It's a boring answer: it's tiny.
There's almost nothing you download when you visit. There's no JavaScript and we use whatever font you have as the default.
It's not a trick, it's just how things used to be. It has to load on a 28.8 modem, so on your modern machine it's going to feel zippy.
Modern websites can feel zippy too.