After a check on the Control Panel:
I was surprised to see that the default power plan was on Balanced.
In order to switch to High performance here's a sample of a GPO to deploy for Windows 2008 / 2008 R2.
On a GPMC console disable the User Configuration ;).
For the setting go to the node:
Computer configuration\Preferences\Control Panel Settings\Power Options.
On the contextual menu select:
New\Power plan (Windows Vista and later)
Select the following settings:
- Action: Update
- High performance
- Set as the active power plan must be enabled.
select * from Win32_OperatingSystem where Version like "6.%" and (ProductType = "2" or ProductType = "3")
For more information about this WMI filter: Creating WMI and Group Filters
After a gpupdate /force /target:computer normally the server by default is on the right power plan.