Ok heres the numbers I come up with
I didnt actually check my sliders but they were exactly the same for each test
I took off from Topeka KS and headed to DEN
35 fps without clouds at alt (I have it locked at 35)
25 with clouds at alt
13-28 on appr w/o KDEN scn clouds few at 6,0000ft no lower than 13 while txi
6.5 - 13 on appr w/ KDEN scn same clouds 4-7 while the buildings are in view on txi around 15 without the buildings in view
BTW I loaded the executive scenery at my HUB DFW and the same effects there as well