[https://games.etherpad.mozilla.org/20 Feedback from Games Work Week]
There's now a draft for a window.performance.now() property which should fulfill our needs here. The function returns a counting value which counts milliseconds. Spec at [http://dvcs.w3.org/hg/webperf/raw-file/tip/specs/HighResolutionTime/Overview.html].
= Mobile =