It's all about optimizing, Chohole! Considering the low resolution of the final image, you could, for example, get by without using super-high resolution terrains. Also, looking at the image, it calls for 6 land terrains. There are technical things aside, of course, but learning how to make a terrain do different things in different areas will lower your poly count cosiderably. What need for merging the files? Why are there more than one file? Even my smallest PC, and Athlon 2000 with 512MB RAM, would have no problem processing the scene. Not bragging, just stating the facts... I'm thinking that it's the trees that are eating you up. For trees that far away, there is no need for hi-poly trees...