Has anyone here used this interesting application.
http://www.versiontracker.com/dyn/moreinfo/macosx/23412
I have it installed and am testing it; not for my need, as I have a dual 1.2 GHz G4, but for older/slower macs. My wife is driving a dual 533 G4, and frequently complains of its slowness. I have a couple kids with 400 & 450 MHz iMacs that would benefit if this proves useful.
Rick 
No change was noticed on an 600mhz/640mb/20gb iBook (Dual USB)
I, also didn't see any improvements using it. Using MacTheRipper, I extracted a 7.5 GB Main Feature DVD, twice. Without SF, it took 25 Min, 36 Sec. With SF enabled, it took 25 Min. 32 Sec.
Not much of a gain.
Rick
if you use OS X on any of the machines have you ever tryed shadow killer i did on my Beige G3 AIO in OS X 10.2.8 and it speeded it up allot.
I tried searching for Shadow Killer, but couldn't find it.
Rick
ive used shadow killer and it does help, but makes it harder to use alot of windows at once.
A google search for "OS X Shadow Killer" brought it up as the first link.
Here it is.
Start a slew of background tasks and then try it again.
I was running quite a few, including Azureus which uses about 15% processor. I had Activity Monitor on when acceletating MTR, and even though I had SF set to decelerate other Apps, Azureus continued to use the same amount of processor.
I didn't test this on my wife's computer, but I wasn't impressed with the results on mine.
Rick
is a graphical renicer. Unix has the command line command renice, and this is a front end for it. If you google OS X graphical renicer or renice you ought to come up with a few of these.
I am just starting to learn about Unix. Up until now I have just been a user with no real understanding. I noticed when I had the activity monitor up and activated SF, most of the processor activity transfered from "User" to "Nice". Can you explain just what "Nice" is and what it does?
Rick