The loss of FPS when moving on the ground (DX10)

[Ales-X 0]

Hello,

I have a strange problem. I have FSX in DX10 mode (fixer), everything works perfectly, except for one crucial thing altogether. When moving on the ground rapidly decreasing frame rate. The moment the plane off the ground, the frame rate returns to normal. So, I'm waiting to start, fps okay, I'll start to creep, fps starts to drop rapidly, the plane lifts off the ground, fps shot up.

For this reason, I did a clean install of FSX. (including the operating system), the same result.

 

What can be the cause? I tried everything possible...

 

System:

OS: Win7 64bit

CPU: I7 950 (4Ghz) (Disable HT)

GPU: GTX570

RAM: 24GB

 

Thanks

 

(Sorry for my bad english)

[Amnmaddox 2]

maybe your detail radius?