This forum in particular, loads all the pictures in a thread when you open the first message if viewed in linear mode. For example, open Brad's TRex thread, it will take quite a while, where as a thread with no pic's comes right up. I don't think there is anything wrong with your 'puter Tom. Just life on the net.
One thing you can do, is set your personal profile settings on here to not show users Avatars and Sig's. That should speed things up a tad.
EricV