Interesting. I have it on the latest generation of MacBook AIR running Mountain Lion and am not experiencing any problems. I use it when traveling and take a small WD 1TB Passport USB3 drive for extra storage. I typically do not edit a lot of images at one time keeping the image count low per folder. Being and AIR, it only has a 1.8GHz Intel processor. The one big difference I can think of is that it's local drive is a pretty fast SSD instead of a traditional hard drive.