back when i had my Geforce2GTS as my main video card i noticed FOG was a HOG ever since ive kept it as far away from me as possible, its the same principals as clouds
i guess it would help if i was rendering 300+m away from me, but i dont, i usually keep it around 64-96m (unless i need it like for planes and such)
my rational behind this is, well i cant see past 64m WTH am i rendering all this fog?
The differance in visuals, well instead of a blue wall of nothingness with fog around it, i just get a blue wall (and earned on average 5-10 fps depending on the situation) biuldings dont fade off in the distance as nice, but again who cares im not looking at them anyways
On newer video cards the difference isnt as great but if your trying to squeese every fps out of your machine it would be worth a try.
currently on my machine i have SL gfx setup as such
GFX enabled...
Ripple Water
Shiny
AV rendering normal
Terrain some
res 1280x1024 fullscreen
Adv Gfx
(128mb on a 128mb card)
Object Detail 50%
Tree Detail 50%
AV Detail 50%
AV vertex program enabled
Draw Distance 64m
Fog Distance Ratio 4.0
Drop DD if 0 FPS
Bumpyness DD 10m
Max Particle Count 4096 (on the gf2 i kept this at 2000 something)
Outfit Composit Limit 5
My current hardware (that matters)
Mainboard Gigabyte GA-7VT600
Chipset VIA KT600 (8237)
CPU AMD AthalonXP 2200+ 133mhz FSB +DDR (266)
(native 1.833 ghz oc abit to 1.9ghz)
1.5gb ddr 333 memory (standard issue generic ram, nothing magical)
PNY Geforce 6600GT 128mb AGP 8X
(stock speed, i havent had it long enugh to uber mod it like my GF2GTS)
A real netgear network card (none of this leech cpu cycles integrated stuff)
A real soundcard (sound blaster live, old model but good)
PCI bus is overclocked to 35 mhz (instead of 33)
AGP bus is OC by 2mhz as well (just tweaking without getting extreme)
(windows 2000 pro fully updated, with some reg tweaks by xteq's xsetup)
And what is my Framerate?
well in the welcome area about 25-30 fps, course this goes up and down abit in realation to traffic
@ my land in Jouppi bout 60-80 fps
and way up in the sky , heh well at 580m here is the result (this picture isnt doctored its just cut out and placed in a sl happy frame so i could joke around with buddys about how the framerate is totally unacceptable)
cheesefactory.us/evil_laugh.bmpps thats cyberflight you see under the info window without the feather texture