Low FPS on Decent system

[mikec5airguard]

Hi all, just bought Il-2:1946 and have it patched to 4.10.1m, anyway whenever Im over a large city(berlin) my FPS drops off to almost nothing.
I have an i7-950 OC'd to 3.07ghz, Twin GTX580's in SLI( 275.33 drivers), 12GB DDR3 RAM so whats going on?

Here is my OpenGL section of conf.ini:

[Render_OpenGL]
Shadows=2
TexQual=3
TexLarge=1
TexCompress=0
TexMipFilter=3
TexFlags.UseAlpha=0
TexFlags.UseIndex=0
TexFlags.UseDither=1
TexFlags.UseClampedSprites=0
TexFlags.UseVertexArrays=1
TexFlags.DisableAPIExtensions=0
TexFlags.PolygonStipple=1
TexFlags.DrawLandByTriangles=0
Specular=2
SpecularLight=2
DiffuseLight=2
DynamicalLights=1
MeshDetail=2
VisibilityDistance=3
TexLandQual=3
TexLandLarge=1
LandShading=3
LandDetails=2
LandGeom=2
Sky=1
Water=4
Effects=1
Forest=3
HardwareShaders=1
ForceShaders1x=0

[Render_OpenGL]
TexQual=4
TexMipFilter=3
TexCompress=0
TexFlags.UseDither=1
TexFlags.UseAlpha=0
TexFlags.UseIndex=0
TexFlags.PolygonStipple=1
TexFlags.UseClampedSprites=0
TexFlags.DrawLandByTriangles=0
TexFlags.UseVertexArrays=1
TexFlags.DisableAPIExtensions=0
TexFlags.ARBMultitextureExt=1
TexFlags.TexEnvCombineExt=1
TexFlags.SecondaryColorExt=1
TexFlags.VertexArrayExt=1
TexFlags.ClipHintExt=0
TexFlags.UsePaletteExt=0
TexFlags.TexAnisotropicExt=1
TexFlags.TexCompressARBExt=1

TexFlags.TexEnvCombine4NV=1
TexFlags.TexEnvCombineDot3=1
TexFlags.DepthClampNV=1
TexFlags.SeparateSpecular=1
TexFlags.TextureShaderNV=1

HardwareShaders=1

Shadows=2
Specular=2
SpecularLight=2
DiffuseLight=2
DynamicalLights=1
MeshDetail=2
VisibilityDistance=3

Sky=3
Forest=3
LandShading=3
LandDetails=2

LandGeom=2
TexLarge=1
TexLandQual=3
TexLandLarge=1

VideoSetupId=17
Water=4
Effects=1
ForceShaders1x=0



Thanks

Mike