Holy crap.... Hummel, nice piece of work! I'm working on a new project that is 60 square miles. The Island is 45 miles long and is "Isle Royale" a National Park located in Lake Superior. I would love to put you system to a major test.
I imagine I could use the same features that I use with my multi terains such as terrain lod and cashing as I see that there many verticies to allow the wave action. I believe that I could get it to work but I assume the terrain edges might be problematic.
I get 90 fps looking out to sea and 35 fps with the full island across the whole screen. The system I am testing it with is an old Sony Vios with Windows XP, Intel Penium (R)D CPU 300GHz and 2.0 GB of Ram with a new GeForce 9800 GTX+
I do notice that the tree palms look very strange under low light conditions. I really appreciate your project and your work. Please update me when you can... When might it become available? Thanks for your efforts...