This guide describes important tuning parameters and settings that you can adjust to improve the performance and energy efficiency of the Windows Server 2012 operating system. It describes each setting and its potential effect to help you make an informed decision about its relevance to your system, workload, and performance goals.
The guide is for information technology (IT) professionals and system administrators who need to tune the performance of a server that is running Windows Server 2012.
--> please see the rest on the blog : http://blogs.technet.com/b/fabricem_blogs/archive/2012/11/14/performance-tuning-guidelines-for-windows-server-2012.aspx