Have you ever changed the priority of a process in the Task Manager?
Do you have to do it often?
Do you want your database server or media player to know the priority it should work with?
If so, you have two choices: do it manually every time or automate/manage the process. If you prefer the latter then a tool you should check out is Prio Process Priority Saver.
Once installed, you just set the priority preferences of the processes you want to modify and then make sure the option to save is checked. Then the next time the program starts your saved settings will be applied automatically. This utility is ideal for power users or system admins who are looking to get more control over their server processes.

Jason Faulkner is the man who brings you our daily tips. He is based in Atlanta, Georgia.
This is another case where AutoHotKey comes to my rescue. I automate the start and set the prority. Like this:
Run P:\Program Files\uTorrent\uTorrent.exe, P:\Program Files\uTorrent
Process Priority, uTorrent.exe, L
That way when the browser wants to download while something is downloading, uTorrent politely step aside and waits. So no slowdown in Firefox.