Hi,
At Kneighbour's suggestion I ran some tests this morning. I took some screen shots. I have a Win 64 Pro 64bit system i7 3770 with 16 Gb ram and a GE Force GTX 680 video card with 4 Gb ram.
The first one is upon initial loading:
16fps
The second is with SkyMaxx off:
41 fps
I turned SkyMaxx Pro back on and I then went into the SkyMaxx config:
14fps
I enabled cloud reflections:
Now I have 41 fps with SkyMaxx Pro on: