Atahualpa SLOW to load!

Hi,
I have pretty much committed to using the Atahualpa theme considering the time I have already put into customizing it. However I am really frustrated at this time in how slow my WordPress blog is loading. I have my WordPress in a subfolder of my main site. The main site seems quick to load but when I try to access the WordPress page it takes anywhere from 7-8 seconds to several minutes to load. Sometimes quicker sometimes slower. I am not sure what decides how long it will take at any given moment. Also the Admin pages can be real slow to access also. I am not sure if it is an issue with the Atahualpa theme or with my host provider. I don't think it is Atahualpa because I have tried switching themes and it was still slow. I am not sure if it is my host because my main site seems quick enough. The only thing slow is my WordPress installation. I would be willing to switch hosts if I knew for sure that was the problem. I have seen threads on the WordPress Forum that other people have started because of the same issue so it seems I am not the only one that this happens to. I just do not know where to turn and am hoping that someone here might be able to help me track this down!!!

Main Site:
http://rackphoto.com

WordPress/Atahualpa page:
Http://rackphoto.com/pp


Thanks,

Ron