Existing users, 
renice 20 -p pid
where pid is the process ID for xBack which you can obtain from Activity Monitor. Of course this only takes effect until you log out. Developer should make this permanent.
xBack
replaces the desktop picture with a screen saver
Version: 3.7.6
xBack priority
Feedback Type: Usage Tip
Contributed by: gpell Sunday, June 26 2005 @ 08:37 PM PDT
Product Platform: MacOSX
Used Product For: Less than a month
Recommend Product: YES
To avoid xBack causing any slowdown for your work, you need to reduce the scheduling priority of the xBack process. In Terminal, type
Comments
xBack priority: use "Renicer" (freeware) - m-bomb
Use "Renicer" (Freeware) if you don't want to deal with Terminal. It lists all processes and set the priority to anything you want. You still need your admin password of course. Remember that nice is a bit counterintuitive: -20 is the least "nice" to all other processes (maximum processor use), and 20 is the "nicest" to all other processes (i.e. the least processor use). "Renicer" is a really great thing to have around anyway. (You bad, bad Virtual PC, I'll show you what's what)Friday, March 24 2006 @ 04:37 AM PST
sudo - scott929
You need root access to renice a process. Use "sudo renice 20 pid" and then type your password at the prompt.Reniceing to 20 may cause it to be too jumpy you will probably have better luck with 18 or so (sudo renice 18 pid)
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Monday, September 26 2005 @ 12:51 AM PDT