First iMac and I'm loving lots of things about it (spec as per signature) but now that I've finally got it close to the stage where I can start to do some photo editing on it, I am getting really frustrated at the length of time it takes to access sub-folders in my photo library. It's just taken TWO MINUTES to display the contents of a pictures folder on my hard drive. This would've been instantaneous on my old PC (even if said PC started to creak and run slowly once I started to use Lightroom). This can't be right surely, not on a machine of this spec? Everything else runs super-smooth. Sub-folders can be very slow to open directly within Finder but the problem is definitely far worse if I'm trying to open within Photoshop. Any help/advice appreciated.