Was wondering if anyone else was experiencing this problem. My wife is a photographer and she uses Lightroom 3.6 (with Photoshop of course) to edit her photos. I have noticed that as she uses it, my memory usage goes sky high, almost using all the memory on my machine, which is 12GB. We have the free app FreeMemory to see the usage. Is this normal? Should it be using that much? iMac model is listed below.