The Epik theme itself doesn’t have any graphics/images, it’s all css being used to handle the colors, so I doubt that’s it….unless you’ve added images in your widget areas/content areas. It’s still not supposed to be slow, but that really just depends on your host. I’ve had this theme with a lot of images on a good host and it loaded fine. It even loads fine on a “slower” host that I’ve seen someone using.