As you can see by the pictures, the track I am creating has a lot of trees around it which looks great and gives the track a really good atmosphere of being in a forest. Unfortunately, despite the fact that I have a relatively good PC (AMD Athlon X2 6000+ 3.1GHz, 3GB RAM, ATi 3850 512mb) framerates are beginning to suffer, and that's without the shadows from the trees which are required to create that feeling of driving through a tunnel of trees. The reason for this is evident when I look at the wireframe view - the trees have so many polys it's ridiculous.
I could use tree walls to create the same effect, but I feel this would not look anywhere near as good, so I was wondering what you guys think, whether I should get rid of some of the trees and use tree walls instead as a compromise.
I was also wondering whether it is possible to create shadows without them ruining the framerates?