with the fx below 5900 u should edit ur files and change a few things
i run a 9600non pro that i overclocked it was 325core/378memory now its 432core/418 memory also changed the cas on the memory to cas1 from the orignal cas3
only times i go below 25 are in some teleporters mormaly over 32fps
ill list a few we found helpfull when tweaking cards for better perf
[D3DDrv.D3DRenderDevice]
DetailTextures=false <set to false to gain perf and loose quilty (all3) >
HighDetailActors=false
SuperHighDetailActors=false
UsePrecaching=True
UseTrilinear=false
AdapterNumber=-1
ReduceMouseLag=True
UseTripleBuffering=true
UseHardwareTL=True
UseHardwareVS=True
UseCubemaps=True
DesiredRefreshRate=60
UseCompressedLightmaps=True
UseStencil=true <duno what it dose but no perf loss>
Use16bit=False <set to true for lower end cards>
Use16bitTextures=False
MaxPixelShaderVersion=255 <change this becouse fx below 5900 dont do ps2.x for ****>
UseVSync=False
LevelOfAnisotropy=2 <tweak this to get better perf but remmber can cause un wanted effects)
DetailTexMipBias=1.000000
DefaultTexMipBias=-0.500000
UseNPatches=False
TesselationFactor=1.000000
CheckForOverflow=False
DecompressTextures=False
UseXBoxFSAA=true
[PixoDrv.PixoRenderDevice]
FogEnabled=false
Zoom2X=True
LimitTextureSize=True
LowQualityTerrain=true
SimpleMaterials=True
TerrainLOD=5
SkyboxHack=True
UseVisibilityQuery=False
FilterQuality3D=3
FilterQualityHUD=3
HighDetailActors=False
SuperHighDetailActors=false
ReduceMouseLag=False
DesiredRefreshRate=0
DetailTexMipBias=0.000000
Use16bitTextures=true<these2 settigns for all mx and fx5200-5600 cards help alot>
Use16bit=true
UseStencil=true <duno what it dose i set it to true and see not dif in perf>
UseCompressedLightmaps=true
DetailTextures=false
UsePrecaching=True
[Engine.NullRenderDevice]
DetailTextures=false <set them to false like i did(not on my system) bo gain perf but loose quility>
HighDetailActors=false
SuperHighDetailActors=false
UsePrecaching=True
UseCompressedLightmaps=True
UseStencil=true <agin no clue but no perf loss so i leave it on>