I've noticed this problem before but now it's really driving me insane.
It takes about a sim hour for my sims to change clothes. Especially with the installation of seasons (which I adore) my sims will stand for about an hour in front of a toilet or before they go outside in cold weather before they finally change. Is there a way to make this go faster? It's really getting ridiculous.
It could be though that this computer sucks and I am getting one before I go to university. But still, for the few months I have left, this would be lovely.