Activate Steinberg Audio Power Scheme
You are right! 
[Devices],—> [“Device Setup”] ; ----> “VST Audio System”
Uncheck------> Steinberg Audio Power Scheme
It seem that I have overseen that this option even were checked or exist inside Cubase 7? 
I think it might be more users then just me that have accidently checked it, thinking that it would give them better performance with Cubase. On many systems its just the opposite. 
I feel the included information inside Cubase 7 is very misleading too
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From Cubase help: Activate Steinberg Audio Power Scheme
Win only: The Steinberg Audio Power Scheme optimizes Windows power handling for best possible audio performance at low-latency ASIO settings. However, this also increases the power consumption of the computer.
If power consumption is a concern, please disable this option and increase the buffer size of your audio hardware.
This is not correct at all. Its actually the opposite on many systems if you have setup your system correctly! 
Its actually cause on many systems the computer to perform less then before it were checked? “Steinberg Audio Power Scheme” cause “sleeping”, stop your disks in 20min, sleep the USB ports and under power the USB-ports it also can cause dropouts especially with USB Soundcards. Lower the graphic and so on. Nothing that you might think it should do get you better performance.
“Steinberg Audio” default-plan settings that claim to be setup the computer to add performance but are based on ECO-Balance-Mode plan. NOT ---->> “Performance”-mode"-plan.
IF Steinberg should based “Steinberg Audio Power Scheme” on something they should based it on —>> “Performance mode”. What are they thinking when they based it on “Balance-Eco-sleep”-mode? 
*Note: The “Performance mode” is that you want to use on a DAW computer or Multimedia machine. That are = to more POWER consumption better overall performance, no sleep , no disk stop after 20min, full power on graphic etc…
Hope it help!
Best Regards
Freddie