Agree your idea looks interesting. One crit, I think that texture on your tracks looks very stretched. Looks like your in blender, you should easily be able to duplicate it along whatever axis that is. keep it going man.
Gfx card doesnt really matter that much when you render, its more cpu & ram based. And there are quite different dual cores out there =) (not to mention vista is a ram eater). Anyway, it appears to be a way too long time to render.
Does your snowy background have a high sub surf modifier number?
Maybe you could try playing with the RT settings. Not sure if your aware of this one cause its sort of hidden. If you go to the render panel. Where it says Anim, there is a small panel called RT. if you click the right arrow so that it says 1 another panel will Appear called render simplification. If you back these settings off you should see an improvment in rendering times. See attched pic.
thanks for the advise
what do you mean by high it has a subsurf of 4.
and here are some mesh pictures from the plane snowy underground and the sphere sky plus a render of the background allone the render took me 17 seconds. so it looks like my computer has problems with calculating the shadows. becouse te car allone wil take me 1minute and 42 seconds to render
Hmm. Yeah the background looks fine. So if its the shadows how many samples do you have them set on? How many lights do you have? And are the shadows set to adaptive or constant? Its wierd it just shouldnt be taking that long at all.