While I was playing STCC1a server, lag suddently.
After that I restart my LFS..OMG

Thats just funny , did you get it fixed yet?

Something with your graphics card buffer or such. I use to get that all the time with my old PC. That is what I had been told at the time. I would get it with other games than LFS as well. It would dump my FPS from 30-40 down to around 5 too. Reboot the machine to temporarily fix it. I'd suggest graphics drivers upgrade or possibly even a DirectX upgrade (current direct X is 9.0c)

Quote from mrodgers :

Something with your graphics card buffer or such. I use to get that all the time with my old PC. That is what I had been told at the time. I would get it with other games than LFS as well. It would dump my FPS from 30-40 down to around 5 too. Reboot the machine to temporarily fix it. I'd suggest graphics drivers upgrade or possibly even a DirectX upgrade (current direct X is 9.0c)

I have the updatest driver and dx.
My LFS is back after reboot.

Problem solved, thanks all

same thing happened to me. its never happened before in 4 years with 3 different videocards. and various other hardware.