So I have a bunch of small games on my site. Ludo, tic-tac-toe, carrom, rock-paper-scissors. Nothing fancy, the kind of thing you'd think runs on a potato. They're built with Three.js , which is the standard library for drawing 3D graphics in a web page. I was testing them on my iPhone and the phone got genuinely hot. Hot to hold. And here's the part that bugged me: I wasn't even doing anything. I was just sitting on the Ludo board waiting for my turn. Nothing on screen was moving. My first ...