I am currently using a white Macbook (2.0 GHz / 3GB / GMA 950) from 5 years ago and it is performing admirably for most daily tasks; the only that stretches it a bit is my RAW photo editing on Lightroom 3. I process photos from my Canon EOS 60D, so we're looking at ~20MB images. I'm thinking about getting a new machine and am considering the following. Note that I'm not concerned about the hard drive capacity, since I use external drives extensively anyway. MacBook Air 13" / 2.13 GHz / 4 GB 1066MHz / GeForce 320M MacBook Pro 13" / 2.7 GHz / 4 GB 1333MHz / Intel HD Graphics 3000 Between the above, which would perform better? I note that the MBA has a dedicated GeForce and the MBP13 has integrated. Would I see a significant bump in rendering performance (Develop Module) over my current machine? If there's not much difference, I might have to pony up for the MBP15... NOTE: I've seen a lot of varying commentary on Lightroom performance - I've read a lot of that via search button - but wanted to get a sense of the relative performance to my current C2D. It's a shame Lightroom isn't on the images of the machines at the Apple Store.