Well, I actually run Photoshop on an Intel iMac (2x2GHz). It is usable, but not snappy; kinda pokey, actually, especially for say sharpening a large file. Now I haven't used it on a G5 or even a power book (although I do own one, just never got around to it) but there is no way in hell it is faster on my Intel iMac. There are a few bench marks kicking around to prove it.
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