Hmm... well, I'm not sure on your laptop, but I'll tell you how to change it.
And, yes, you are right, it is power saving mode.
Control Panel > Mobile PC > Power Options > [Select a Plan]
On my computer, there is "Power Saver" "High Performance" and "Balanced", and I'd assume you'd want to change to High Performance.
Each one is customizable if it is not exactly how you want it.
Sorry if it doesn't work like this on your computer...

If it is how it works, hope you can get it to how you like it!
