To quote ndicki from elsewhere
QUOTE
I've been fiddling with my config settings. First, I deleted the existing (made following the GC settings now available at Reg's) settings, which were causing me to get less than optimal FPS. Then I let the config.exe rebuild me the file from default.
I set sliders at 3, except aircraft and effects = 5, and clouds = 1. Then, no movie, and:
<DualPassRender val="n"/>
<HighResolutionZBuffer val="y"/>
Then, the GC version says you should set
<aircraftmodels Scale="0" MaxDim="0"/>
not 2048. But as I've just tried
<aircraftmodels Scale="0" MaxDim="2048"/>
and got a very slight possible rise in FPS - about 3 to 4 FPS...
The line which suddenly did the trick and made the hi-res textures beautifully razor-sharp was this one:
<CompositeAircraftTextureUsage val="D3DUSAGE_RENDERTARGET"/>
The original was set to "0".
With the "as recommended" GC settings, I got a significant drop in FPS compared to normal settings. With this way, FPS stay high.
Hope this seems coherent...
END
Since the GC suggestions there has been no clear suggestions fro higher end PCs