Good article by zapotec indeed.
#5 in that list (Deactivate Devices in the Windows Device Manager) is what I was harping on, and as riojazz says, is more tweaking than genuine "optimizing".
I turn off a lot of stuff - my touchpad (I have a mouse plugged-in), iTunes, onboard soundcard, WiFi, Bluetooth, anything Adobe, it's a pretty big list. My Win install has 100+ processes shown at startup and I am well below 100 by the time I am ready to start SONAR. And I do have my comp set to basically run at full power all the time - power management "features" can be a PITA if they start powering stuff down when you least expect it.
Does this all help? I don't know, I certainly haven't benchmarked it at all, but my copy of SONAR runs good on my system with very few pops here and there when live playing/recording (that never translate to a mix-down anyway) by doing this. It may be as smooth without doing all of that - but I am old school and tend to turn off everything I can when I need to make sure that the computer needs to run as smooth as possible. But with 4 cores @ 2.7+ Ghz, with 8GB of RAM and almost 400GB of free on a 500GB drive (SONAR and Windows are only 2 major installs on my laptop) - X3d runs pretty good anyway. I do get some hesitations in screen redraws and the start of playback in larger projects, sometimes, if I forget to kill all those background apps and TSRs first, but it would still be usable honestly.