I have tried to render your image since this morning in 600x450 and broadcast. When the anti-aliasing comes to the foamy part at bottom of the waterfall, it took: 87 minutes for 51% 144 minutes for 52% 208 !!! minutes for 53% when it started to render the 54th %, I stopped it. But no problem, I found the solution? Will send it to you as soon as I can. Guitta