Activity Monitor isn't showing anything obvious. Looks I'm about 15 pages into the Apple Support Discussions and i'm beginning to loose the will to live!
Should have bought a windows laptop
Lets not go down the Mac V Pc road as we know Mac's are far better
Macs
are PCs - they are personal computers. The hardware your Mac runs on is identical to the hardware on a nicely spec'd Windows machine. I think you mean "Mac V Windows".
And no, they're not.
/obvious troll is obvious?
//also, to be somewhat helpful and not make you entirely disgusted with me, similar issues on my mum's iMac resulted in eventual hdd failure. Back up everything NOW if you haven't already, and buy a replacement hdd to fit in there sooner rather than later. Avoid moving hundreds of files at once - this is what caused hers to eventually fall over. Recommend you back up files incrementally over a course of day in small batches, starting with the most important files first.
///Remember kids, HEAT results in hdd death. In a laptop resting on a duvet or a pillow or a cushion, the problem is magnified.