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    Perhaps some examples would be useful, then people may be able to point out specific optimisations. Commented Apr 21, 2011 at 14:33
  • CSS3 is going to be slow because it relies on the browser to do the rendering and CSS isn't that fast. I've even noticed if you use a lot of box shadow properties on a single element the page will freeze when you scroll past it. CSS3 is nice, but it's not ready for the "prime time" Commented Apr 21, 2011 at 15:21
  • @akamike - There's a link there that you can use to see what I'm talking about... Run that site on iOS, and boom... Sad faces all around... @Seth - I find it hard to believe (doesn't mean you're wrong here) that CSS3 performs worse off that javascript animations. The difference is present on desktops, with CSS3 taking the lead in some of the examples I've seen. I do believe that on the iOS, the devices are running on underclocked speeds, and only 3D requests allow the clock to scale up, hence increasing performance... Commented Apr 22, 2011 at 1:29