Hellborn, Some second thoughts... I rotated the huge ocean terrain I made by 180 degrees, and then saved it. The rotation has effectively hidden the strange ridge or bump that shows up- only on one end. Coming back later and trying a new render test, I was surprised to find that it rendered much faster- just about like the first terrain you made. So I have concluded that Vue 5 has an "adjustable" way of dealing with these new terrains. So- by saving and then re-opening them it seems they work fine and render just about as fast. This same thing seems to happen when you first try to render them- Vue 5 reports like 9 hours, then 5, then the time rapidly drops down to just minutes. So the software is very ADJUSTABLE once it has made its own internal calculations. I guess I'm still getting used to this effect. It shows that you cannot trust the initial render estimate times- and just have to wait about 60 seconds to see the real render calculations begin...