My mum has a 2007 iMac, running some OS that has the App Store. It is incredibly slow. I'm talking 30 second waits to open System Preferences. She doesn't care, as she rarely uses it. But soon she has to work from home for a week, so she'll need to use it. Is there anything that can be done to speed it up? Would a reinstall of the OS do anything? It seems to constantly be using 1.99/2.0gb ram, though I fail to see what's actually using that much, it lists about 500mb in use at any one time.