Well, it depends on what is being rendered. Some Layers list or specific lighting can be quite intense. But between the 2 Vue is slower, by far from my experience w/ the 2.In fact, carrara has been faster than the other renders I have used. There are many little settings that can be used or not used to optimize this tho...might want to play or give specifics for some help.All 3d apps will take all they can get.It could very well be your lighting settings.This is, of course realtive to what you were expecting. :)

No need to think outside the box....
    Just make it invisible.