I suspect what is happening is that the display pipeline is not able to keep pace with the constantly changing map rotation, especially because the iPad 3 retina display requires a lot of fine detail in the graphics.
As a workaround, can you try disabling the renderNativeResolution property on all the graphics layers and see if that makes things better? I have a feeling it might because the graphics layer will not try to draw in such great detail. You may see a slight degradation in the crispness of your graphics, but it may not be noticeable.
Please let us know.
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