A couple of researchers/developers and I have been working nights on an gamemaker:HTML5 game to connect to Moodle as a part of research into games enhanced learning. We are also interested in checking the performance of HTML5 in general and have played with it quite a bit over the past 6 months. Though performance could be better, it is likely that the main problems with HTML5 performance relate to graphics acceleration and browser compatibility. Our game, though simple, runs surprisingly well. The game below is only an early version (2 weeks work) but we have been able to grab a user id from Moodle and use this to drive a graphical interface in HTML5 built with Gamemaker and using php/sql hooks (10 half days work). Students are currently playing the game and giving us feedback as we evolve it.