SPA, not your typical freeware
In the Vital Signs workshop, we touch upon the tool SPA (Server Performance Advisor). This unsung hero of performance evaluation deserves some love, which is why I'm writing about it over 5 years after its last update was published and made available on the downloads site, here:
So, Clint Huffman, creator of PAL, wrote up this excellent article on how to troubleshoot server performance problems...
So, check it out here:
https://channel9.msdn.com/Wiki/PerformanceWiki/HowToIdentifyBottleneckSPATool/
It's the bomb, and it's free as in beer.