Thanks Prey !
http://forum.preys-world.com/viewtopic.php?t=17774
"Want some super speedy framerate tips...well do you?
Well you can't blame master_chief for being rude.................nope joking. Here goes.
*NOTE* these tips only work with V-Sync OFF....OFF I SAID
For nvidia cards
1. Download and install the latest NVIDIA ForceWare drivers.
2. Download and install the "Coolbits2" registry tweak:
Coolbits 2
(To install, unzip then double-click the .reg file to apply the registry mod)
3. Go to Control Panel -> Display -> Settings tab -> Advanced -> GeForce XXXX (your card model)
4. Expand "Performance & Quality Settings"
5. Click on "Additional Direct3D Settings"
6. Change "Max Frames to render ahead" from 3 to 0. 1 seems a very good setting.
7. Click "Apply" then "OK" to exit the settings page.
For ATI
For ATI users, you can adjust the 'Flip Queue' setting which is the equivalent setting to the one above by installing and using ATI Tray Tools. The same values apply to both cards.
Download ATI Tray Tools
Adjust same as Nvidia. Try a Flip Queue of 1 then 0 and see what's better.
-------------------------------------------------------------------------------
Locate
Ubisoft\Tom Clancy's Rainbow Six Vegas\KellerGame\Config\PC\KellerEngine.ini
If you installed to a different directory just locate
KellerGame\Config\PC\KellerEngine.ini
People will tell you to edit othe ini files but only KellerEngine.ini has any direct effct on the game engine. The others are for default bootups.
AS ALWAYS BACKUP KellerEngine.ini BEFORE HACKING!
As this is based on the Unreal engine there are a few speedy tweaks we can do, alot actually.
locate the lines
UseTrilinear=True
LevelOfAnisotropy=4
change them to
UseTrilinear=False
LevelOfAnisotropy=2
or you could
UseTrilinear=True
LevelOfAnisotropy=1
I think you all get the gist with that one.
Locate
bUsePostProcessEffects=True
change to
bUsePostProcessEffects=False
Turns off the stupid framerate sapping bloom\blur effects
Locate
UserMaxTextureSize=4096
Change
UserMaxTextureSize=2048
Texture resolutions. 4096 is very high. Too high for 256 meg cards. 1024 might even work. Always work in multiples of 64.
locate
ShadowBufferResolution=1024
change
ShadowBufferResolution=512
Shadow resolution. Will look blocky but your framerate will improve. "
I tried these tweaks and they help quite a bit without noticing any quality reduction. Framerates much better.