your tree models SHARE the texture or does each model is saved with the Texture?
i thought about the same some month ago, but i came to this conclusion:
If lets say you have 5 tree models and each share the same texture, why would you need low-res textures if you will only use one?
Is it the Texture-size or the number of the polygons, influencing the framerate?
im 99% sure its the polygons, unless someone wants to correct me.