Darnassus wrote:
Don't forget the laptop isn't a real laptop, it's a desktop replacement.

Unplugging it from the wall will make the G750 go into power saving and cut down on chewing the battery too hard. Thus the graphics card isn't getting the 'food' it needs to work at 100%. That's why you see the game start to skip slightly and feel a little laggy.

You can fix this by removing the power4gear program. ( Uninstall it through program manager )

Most do this, but I personally don't want to, I feel it conditions my computer for a well being. Again, my personal thought.

cl-Albert wrote:
Curious which bios version you are running?

If you want to risk flashing the bios (wait until a better time if necessary since the system may need to be sent back for repair in the worst case scenario of a bios flash failure), a newer version might help some with this as discussed in this sticky thread:
http://rog.asus.com/forum/showthread.php?35062-Processor-stuck-at-.77Ghz-when-unplugged-solved-w-new...

Darnassus wrote:
Apparently 209 isn't nice, 208 is the best. But if you see not many problems especially for start-up and shut-down procedures, wait for another bios revision that's confirmed for safe download and install.