I used the P3 and the Runtime by Plugin said that Wp E commerce plugin was taking 76%. I had this site set up by a friend in 2010 and I've done very little to it, since I am not an experienced web person.
Any recommendations on how to fix this? How do I make sure that the e-commerce plugin is installed correctly? It was giving me trouble a few months ago, my customers could not checkout, and I just kept reinstalling it every time I realized my site was down.