Very slow on Windows Safari and iPad

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What steps will reproduce the problem?
1. Opening a sample in safari and moving the camera around

What is the expected output? What do you see instead?
Expected : something as smooth as Firefox / Opera / Chrome / Internet Explorer
Seen instead : very slow ! :(

What version of the product are you using? On what operating system?
Windows 7 64 bits, chrome 21.0.1180.75 and Safari 5.1.7

Please provide any additional information below.
Note: for iPad, i added the fix i tweaked explained in
http://code.google.com/p/jsc3d/issues/detail?id=3

Thanks a lot for your help !

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Original issue reported on code.google.com by `merci...@gmail.com` on 12 Aug 2012 at 8:56