You've misunderstood what I was getting at here, that's probably my fault - I'm not saying pre-rendered lighting is graphically expensive, I'm saying it precludes dynamic transitions from one state to another (GTP did an article on this which is why I chose to not elaborate). PD chose to make the game look better over supporting dynamic lighting and thus dynamic time of day and weather. Dynamic lighting is more costly, but if you scale back the other graphical features it's easily possible on the old hardware because GTA games had been doing that since GTA III on the PS2 - It may mean scaling back more than the casual market would like, but I think most people here would prefer that the graphics take a hit but we get dynamism for more interesting racing, right? It's all about choosing a sensible compromise, as are all things in engineering, software or otherwise, and in my opinion PD chose the wrong compromise, likely because good graphics sells.