There's something hinky in your infrastructure. The first connection to your site triggers a 301 permanent redirect. When I tried to connect, it took 3 secs for the initial location to respond and then 41 seconds for the re-direction to be executed.
After that the Zen Cart itself loaded in a little under 10 seconds with half of that being dedicated to downloading the big 215k main image.
So it's not the Zen Cart that's slowing you down, it's something in how your site or your server has been configured.



