If you look at the source, you can see why it is slow. Tons of js linked in there, right in the <head>, no minification. They even embed jQuery twice on there (1.3.2 then later on 1.6.2). Also, lots of inline styles on the page. Looks like they are using a CMS, not sure which one though.
Nevertheless, that 3D rollover effect and infinite scroll in all directions is pretty fun.