Steve,
It seems unrelated to PowerGallery to me. I loaded the main http://mediarapids.net page itself and firebug reported a 45 second load time and that page doesn't have anything PowerGallery on it. It seems like something on the server itself causing this long load time, all PowerGallery is loading is some PHP, JS, and images - nothing super complex in terms of file size and very little server processing needed.
-justin