Hi,
Process priorities can be set in the terminal--I do not have time to explain how to set priorities through the terminal. But, nonetheless, here is some free stuff.
I am not sure if any of the freeware applications are Universal Binaries. It doesn't matter, since they run seamlessly on my MacBook and hardly utilize the CPU--both rarely register on Activity Monitor or the Terminal command "top".
Here is a link to a nice freeware application: SpeedFreak.
Linky.
Just scroll down and you'll find it.
Another freebie is ProcessWizard.
Linky.
This last piece of software is not free but could be useful: Freeze Frames.
Linky.
I have not used Freeze Frame. There might be a freeware alternative.
PM me and I'll explain how to set process priorities in OS X
Cheers.