Recently tips:

Don’t put all product images in the images folder, make deticated folder for each product ( for extra images ) ,  if not, the product details page will very slow.

Image Hander (IH2) will make the page slow, though it’s very cool.

Choose a fast ISP, don’t choose goaddy’s linux hosting service, it’s slowly. Bluehost is good, and Godaddy’s Windows hosting is cheap and fast.