I'm not talking about the terrain's material, or surface texture. I'm talking about the terrain's texture inside the terrain editor... The greyscale height-map which gives your mountains their geometry. And if you were using a Bryce preset mountain, then the technique I mentioned above would DEFINITELY work to your advantage. And, as far as I know, all of the Bryce preset mountains are at 128x128, even though they come in at 512x512 when you add them to a scene...