I don’t think that's entirely correct. While you can't ask the OS to tween the values, nothing prevents you from doing that, other than likely a reduced frame r

I don’t think that's entirely correct. While you can't ask the OS to tween the values, nothing prevents you from doing that, other than likely a reduced frame rate. See this demo: http://stewd.io/pong/ http://stewd.io/pong/ It's still not 100% smooth, but it seems slightly better and demonstrates the ability to manually tween values. Similar performance in both Chrome and Safari.