Have you tried using Pixelmator (http://www.pixelmator.com/)? It's an image editor exclusively for the Mac. It runs quite sweetly, and has helped me put off upgrading the RAM. It runs of the graphics processor rather than the normal processor which makes it much less resource intensive.
I'm off to an apple event in about an hour. Gotta love the macs!
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I'm off to an apple event in about an hour. Gotta love the macs!