I'm sitting here at work on a T1 and it's extremely slow. It's been getting progressively worse over the last few weeks. What amazes me is how much disk space these guys must be using. 3D Commune fires right up for me, but then again, it's a smaller site with far fewer users. It could be a matter of too many users and too much data to parse, or Renderosity has a host with a crappy backbone.