The guys, you know the Deployment Guys over at Microsoft have been doing some tinkering!
To save time deploying the Operating system you can enable the High Performance power scheme in WinPE.
This involves utilizing PowerCfg.exe from a Windows 8.1 x64 machine and the MDT Toolkit.
Head to http://blogs.technet.com/b/deploymentguys/archive/2015/03/27/reducing-windows-deployment-time-using-power-management.aspx for the tutorial.
In my testing I found it only to be beneficial during WinPE but can’t hurt to set it inside the Windows OS as well.