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Do you dual boot or is the PC a separate machine? On a Mac with an ATI card my frame-rate is fine, whether I'm booted into OS X or Windows 7.
I am unable to turn on the shaders when playing from OS X, but can on Windows 7, so either there is a limitation imposed by the drivers, or a fault on Disney's end. I would send in a bug report.
Nvidia was offering drivers for certain cards to fix some issues with the 6.4 update, independent of the computer itself, however I did not see one for your card.
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