У вашего броузера проблема в совместимости с HTML5
This needs more tweaking, but I'm pretty confident in it running well. This is at 720p with FRAPS running and everything set to max.
This is just the beginning area, as well, so it miiiight be a good idea to dig around and lower some of the video settings a li'l bit. I'm not used to modern tweaking and these fancy new settings that don't involve 640x480 ;p
Running between 17-30fps here, which is... alright. Impressive for completely maxing out the game in 720p, but there's work to be done.