Do you want to get a glimpse into how the Microsoft Field Engineers would go about troubleshooting performance issues on your server? Then go and read this blog entry by Denzil Ribeiro. Not only is this an excellent how-to on troubleshooting performance problems, but Mr. Ribeiro provides multiple links that describe the concepts he’s dealing with further, making it a great piece of documentation.
The MS Field Engineer blog is not terribly active, but what gets posted there is worth reading. If you don’t have it on your feed list, you should.