Portege Z930 - process 'System': high CPU when on battery usage

I have a Portege Z930.
A process called 'System' will appear in the Task Manager when I unplug the PC from the AC.

I would like to know why is - this high utilization of the processor (from 9% to 18%) and keep my time above 70 ° c.
It is very annoying, not only because of the temperature that hits the PC itself, but also because of the battery, which can not go over 1 hour and 30 minutes because of this process.

It is not a virus, already CHECKED, don't ask.
In addition, I don't know when it started, or why, so please don't ask.

Thanks in advance,
Nicolas.

Until we start the discussion can you please tell us if you use the original pre-installed OS that you got with your laptop and use Toshiba eco mode when the laptop is running on battery power?

Tags: Toshiba

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