Sorry if it was discussed, I didn't find anything about it.
I have Amd AthlonXP 2800+ cpu and radeon 9550 video card with dvi out. I plugged one monitor from dvi and other one analog. I want to play LFS in both screens but when I change the resolution in windowed mode horizontally to display the game in both screens, FPS is really reducing about 5fps. Is it about my video card or am I doing somethin wrong? I couldn't make it full screen, by the way.

Your cpu and gfx card do look a bit low and the current crop of ati drivers don't let you extend 3D games across 2 screens unless it's running in a window.