Quite often customer tells me that they want to optimize the Windows server performance by running some scripts found on the Internet and they are also setting a bunch of registry keys. In my opinion, this is not just dangerous but can also cause issues later and then everybody is analyzing while spending a lot of time. On the other hand, the same customers do nothing to optimize the user session and waste sometimes a lot of resources and again getting more likely issues.
Let me explain why you should NOT care about the server and focus on the user session.