I hear this conversation all the time about not running your Windows OS Hypervisor to save battery life. There’s instructions on building a different BCD Store entry so you can switch your Hypervisor OFF when your travelling and you don’t have need for running virtual machines. This does differ from hardware to another and especially from Workstation to Server. I don’t rely on one advice but I test it on my hardware. Many good things come from Finland and one of them is a performance metering software called PCMark http://www.futuremark.com/benchmarks/pcmark
Here are my result from my new Dell Precision M3800 “Ultrabook”. And as you can see I won’t be using two different boot options but I’ll just run with my Hypervisor ON all the time.