GTX 660M low performance on battery on Lenovo Y580

Hi everyone,

I'm having a problem with my new Lenovo Y580 notebook, the GTX 660M has a weird low performance when the laptop is not plugged in, sometimes HD 400 can outperform it!
The problem in particular is that video/audio freeze for a few seconds, here's a video that'd explain better:

I ran Nvidia Inspector and Silent Hill Homecoming to see how it actually performs and here how it tuned out,

On battery:

With power plugged in:

Your help is very appreciated, thanks.
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