Thats a good tip Sam
I find with aa/af turned on to 4X each my frame rate drops to 35 - 40 fps and with aa/af turned off FPS go up to 80 - 85 and I cannot discern any change in the visuals.
I have an Intel 6200 due to me having a basic Dell with PCI slots (Not PCI-E)
Before this I had to turn off all In house LFS Graphics Options and run at Low screen Res Which I set to how busy the server was and with integrated graphics used to get about 40 FPS
Now with the 6200 I can turn on almost every Graphic option in LFS and get a steady 70 FPS with aa/af turned off, come to think of it aa mabe set to application run which I think means LFS chooses or sets the best setting.
Anyway when I set aa/af to X4 I could see no real difference in the graphics only difference was my FPS halved.