I opened 150 RAW files (26 MB each) in Photoshop simultaneously as layers. Quite demanding task, I think. Opening lasts some time, which is logical. But when I looked into Activity Monitor, under "CPU" tab, the "idle" was still about 60%. If I understand right, 60% of CPU power was not used during that process. If that is correct, why computer doesn't take more power to make a process (opening those photos) faster? I have 2.6 GHz, which has 4 cores. Is maybe the reason for that, that Photoshop can't take the advantage of several cores?