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Photoshop CS6 Performance — XCode Build
Apple XCode is used for building applications from source code. It benefits greatly from multiple CPU cores.
The build was done twice, since developers build repeatedly, and the first build does all the disk I/O which ends up caching the source files.
The 12-core Mac Pro easily leads the pack here, with its extra cores being well used for parallel compilation.
The newer generation CPU design and slightly faster clock speed of the iMac 3.4 GHz Intel Core i7 come to bear, and it almost matches the 6-core Mac Pro.
The MacBook Pro 2.7 GHz is not far behind the iMac.