Are you experiencing degraded overall performance on a Windows Server 2008 R2?

If the answer is yes then you might need to fine Tune Windows 2008 R2 power options. As per Microsoft KB article 2207548 " In some cases you may experience degraded overall performance on a Windows Server 2008 R2 machine when running with the default (Balanced) power plan. The issue may occur irrespective of platform and may be exhibited on both native and virtual environments. The degraded performance may increase the average response time for some tasks and cause performance issues with CPU-intensive applications"

Kindly refer to the below article for more details

http://support.microsoft.com/kb/2207548