I think that Renderosity may have to find a new hosting company, because this site has been the slowest, by far, that I visit on a fairly regular basis. A number of  high population gaming sites I participate in have been through more than one hosting change before finding the right service. Once they do find the right host, the problems go away. There really can be a huge difference between one service and the next. Most good services can fascilitate a nearly seemless transition, even for a complex site like this.

On the off chance this is a money issue (i.e. not wanting to pay for higher capacity hosting), I can honestly say that Renderosity has lost more than a few potential purchases from me in the last year because even the marketplace can grind to a near halt. Makes browsing for products a chore, then I have to worry about whether my download will be effected if I do manage to find what I want and get it to the cart. I am sure I'm not the only one. The site response problems are costing Renderosity money, probably a lot more than the cost of getting on a better host or hardware.