It's no problem, don't worry
After this I won't be able to explain it any better
The explanation is really simple:
The smooth terrain is because the raytracer can't handle such detailed displaced geometry, so it gets smoother.
The reason that it might look better is solely because you render at 0.25 detail.
With "RTE off" is the result it should have considering your displacements etc. It's the "true" result.
The smoother clouds is probably because the raytracer "solves" the scene in a different way than the rasteriser.
I have tested rendering clouds with the raytracer and it is much slower than the rasteriser. I'm absolutely sure of that.
There are no models in here as far as I can tell so switching RTO is not necessary.
The small differences in rendertime is probably just coincidence.
Cheers,
Martin
