How to analyze performance of windows server?

under server manager>Diagnostics>performance>there's already a default monitor, or you can create and edit a new one dedicated data collector to which process you want to monitor

Thru performance monitor system

To Analyze server 2008 r2 performance, download microsoft server performance advisor then install it.....it will run and find all issues in server which is occurring and monitor performance also.

Microsoft Windows is a family of operating systems by Microsoft for use on personal computers, although versions of Windows designed for servers, embedded devices, and other platforms also exist. Microsoft first introduced an operating..

As @sofiane medhkour mentioned you can depened on default windows monitor or i, suggest that you look for one of system tuners software and under performance section you may reach your goal.