Tuning X window server for high definition

[robertlaferla at comcast.net (Robert La Ferla)]

1.  How can I set the priority of the X window and font servers so that 
they are run at nice -10 every time they are started?

2.  Has anyone succesfully played a full-screen WMV-HD movie using 
mplayer?  I tried some small clips but it dropped frames and then the 
audio quit out.  It takes a lot of CPU to handle 1080 lines of 
progessive video.

3.  Any other performance tips?  I am running Fedora Core 3.