Cheers, just did what you suggested previously & it looks washed out as in a standard atmosphere. I then plucked the waterwheel from the objects section & baked it. Kept the atmosphere the same & it went fast. Perhaps my cube setup was cranky on the previous test. So keep the GI/GR & bake high. The manual suggests that it renders the first frame & that once it has done that then the rest of the frames fall in behind. Gotta go read a bedtime story to my daughter, so will check back later!