screen.frameRate = Infinity;
Note that will peg the CPU though if you're rendering in a loop.
"main": "main.js",
{ "version": 1, "name": "Unnamed Shump", "author": "Eggbert", "summary": "Follow Scott Starcross in his quest to stop the Primus.", "resolution": "416x416", "main": "scripts/main.js"}