Ok, just loaded Vue 4 and tried this with 30 summer cherrry trees and 3 terrains with volumetric textures on them...moved everything around as I did in Vue Pro (camera, window views) and it was staying consistant around 176...would go up and down 2 numbers but that's all...(where in Vue Pro it was jumping up around 50 each time) With OpenGL on and background thread off (same settings in both). Vue Pro's OpenGL looks way better than Vue 4...BTW Also my memory usage in Vue4 was way lower than in Vue Pro and I had more items and polys in it. Vue 4 - 52,372 k Vue Pro - 346,000K I also tried Poser 5, loading MilDragon and V3 and it was stable around the 288 mark no matter what I did. I'm excited, knowing that perhaps it can be fixed soon and we will all be happily rendering :)