No it will not take any longer to render and if it's grouped well will actually render faster. Ya Vob files are rude size wise ay? Got to remember all the textures are saved in them too. I think there just not optimized. Every object has it's texture. Other programs also fake common shapes and Vue does not, Like say you got 1000 spheres. Lots of programs will just have one sphere and the position to draw that single one over and over again. Vue don't work like that. I saves them all indvidually reguardless of how many times the same shape is used.