I am running a screen resolution of 1024x768.  I am using a GeForce4 MX440.  I change to 640x480 S/W and that helped, but I didn't know what it was changing.  The manual doesn't say.  Thanks for explaining what that actually does.   
  
How do I know if my video card supports the other features?  I looked for a feature list around the net, but nothing mentioned those items.  So I am gonna try them out and see if they help.   
  
Thanks for helping.