For some reason my Mac renders about as fast in Vue6i as it did in Vue5i, radiosity does lengthen the render process, but that is the same in any 3d app, due to heavy calculations. But there are many variables to take in account when setting up your scenes to render, by being judicious with settings and not going overboard or blindly accepting defaults you can optimize your render times. By playing with these settngs in both Vue and LW i have been able to reduce render times from hours to minutes. Radiosity is a real time stealer and needs to be set differently for each individual scene, one size does not fit all LOL. That said Vue has a much slower render engine than Lightwave. Ron