This depends on the type of the game, but a fellow developer is beta-testing a canvas based game http://esdao.com . It's works quite well, with the exception of Mobile Safari to my recollection which is supposed to perform better with the next iOS update.
As someone building an HTML/javascript-based animated game myself[1], I'm somewhat aware of the challenges involved and am frankly amazed that the OP has this level of performance coming from HTML/js on so many different game objects.
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This depends on the type of the game, but a fellow developer is beta-testing a canvas based game http://esdao.com . It's works quite well, with the exception of Mobile Safari to my recollection which is supposed to perform better with the next iOS update.
no discredit to your developer friend, but the level of visual complexity that the OP refers to is far in advance the game you linked.
Here's a video of the Aves engine in action:
http://www.youtube.com/watch?v=Ol3qQ4CEUTo
As someone building an HTML/javascript-based animated game myself[1], I'm somewhat aware of the challenges involved and am frankly amazed that the OP has this level of performance coming from HTML/js on so many different game objects.
[1] http://littlecosm.com - a massively multiplayer twitter client!