I didn't realy beleive it until i watched an A-B photoshop test using comon photoshop operations, but a mac is far faster than a windows computer doing the same thing in photoshop. With the same two laptops, the PC was far faster doing 3d modeling, however. (this was a 500mhz mac vs 800mhz PIII laptop...) So, it does all depend on what you're doing, and how the programs are optimized...

Matthew