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Without the intention to lessen what you did ... it's pretty laggy on my Galaxy Nexus in the default android browser.

But cool stuff indeed.

It feels laggy on my old Mac Mini Early 2009 with Safari.

I doubt if canvas(, which is basically a JS wrapper for CoreGraphics in Safari) would be better in performance.

It's not ready for mobile... Audio gets unsynced and animations aren't smooth. :/

Well. Who's bug is it then ;) I'm happy to blame the mobile browsers if you used standards (was not able to get a look at the code cause on the road)