Dean, I've always found my site slow. I've gone back and decreased the size of my images for the web. This has only minimally helped.
My biggest gripe is their support. For example, today I wanted to (oh, I'm not good with the proper techie lingo) but I wanted my gallery link to directly link back to FAA. At the moment, my galleries are full of images, which then need to be clicked on, and then the link to FAA clicked. It seems so bogged down, heavy, slow and unnecessary to have all those steps. The space to insert the new URL link wouldn't work and, believe me when I tell you, I worked on it all day.
The very slow email replies from SS were unhelpful and seemed repetitive.