Well, these are generally pretty interesting to troubleshoot.
First thing is dial back a few things to a more basic (but still pretty and flyable) situation.
1. Backup your conf.ini. We're going to be messing with the [Render_OpenGL] section.
2. From your video card control panel (Desktop), disable FSAA and Anisotropic filtering (for now—we're troubleshooting what will eventually cause the stutters).
3. Not sure why you're using Dither and Polygon stipple. Not needed. We're going to use Shaders version 1, not 2. This will affect some water effects, but don't worry, we can add them back in one at a time after each test and see at what point things get weird (ForceShaders1x=1). We're keeping perfect mode on, of course (HardwareShaders=1). We're dialing down the water (Water=0). We're dialing down the forest (Forest=2). Disabling the AnisotropicFiltering and it's corresponding flag that communicates to the extention in your card's driver (TexMipFilter=2 and TexFlags.TexAnisotropicExt=0).
Everything else should be as it is below.
Try this:
Code:
[Render_OpenGL]
PolygonOffsetFactor=-0.15
PolygonOffsetUnits=-3.0
TexMipFilter=2
TexCompress=0
TexFlags.UseDither=0
TexFlags.PolygonStipple=0
TexFlags.UseVertexArrays=1
TexFlags.TexEnvCombine4NV=1
TexFlags.TexEnvCombineDot3=1
TexFlags.DepthClampNV=1
TexFlags.SeparateSpecular=1
TexFlags.TextureShaderNV=1
TexFlags.DisableAPIExtensions=0
TexFlags.ARBMultitextureExt=1
TexFlags.TexEnvCombineExt=1
TexFlags.SecondaryColorExt=1
TexFlags.VertexArrayExt=1
TexFlags.ClipHintExt=0
TexFlags.UsePaletteExt=0
TexFlags.TexAnisotropicExt=0
TexFlags.TexCompressARBExt=0
VideoSetupId=17
Shadows=2
TexQual=3
TexLarge=1
TexFlags.UseAlpha=0
TexFlags.UseIndex=0
TexFlags.UseClampedSprites=0
TexFlags.DrawLandByTriangles=1
Specular=2
SpecularLight=2
DiffuseLight=2
DynamicalLights=1
MeshDetail=2
VisibilityDistance=3
TexLandQual=3
TexLandLarge=1
LandShading=2
LandDetails=2
LandGeom=3
Sky=2
Water=0
Forest=2
HardwareShaders=1
Effects=1
ForceShaders1x=1