Have you ever tried using TweakXP, TweakAll or ripoff "System Enhancer" software? With ANY Windows platform, you can do it yourself.
Hit Control-Alt-Delete. On .NET Gundam, 2000, and NT, you'll see "Windows Insecurity". On XP Home and Professional, you get Task Manager. In the first case, just click on "Launch taskmgr.exe" ir "Task Manager" and you're good to go.
Now, make sure that you can see all processes from all users (checkbox below). For optimum effect, run priveleged:
runas /user:Administrator taskmgr.exe
sudo taskmgr.exe
For .NET Gundam users, do NOT use KDE System Offguard to do this, you sick Wine/Cygwin using bastard.
Save your work and quit all unnecessary apps. To stop processes, use:
net stop (servicename)
The magic part: right click, set all of the other processes to below normal priority and set AE or rendering app to Above Normal. If you want AE to be the ONLY thing that the processor thinks about, choose Realtime.
Save often and reboot when done.

