Laptop CPU Low?

In my laptop Lenovo Legion Y520 somehow the CPU is not working properly.

Displayed is 0.79GHz although Basi is 2.50GHz. Gester I pressed something with Task Manager and suddenly went up the CPU from 0.79GHz to 3.56GHz. So now my fringe what can I do so he standard at 2.50GHz-3.56GHz remains.

Even at 14% use, the CPU was at 3.56 GHz

What's up

This is not a bug but a feature…

The processor clocks itself down when it is underutilized. Saves electricity, is quieter and produces less heat

But even if I open any things is so low

Yes and? Where is the problem right now? Apart from the value that is displayed.

Try to start a game or something and see if it is still low, otherwise it could be temperature, if the CPU gets too hot it will go down to generate less heat

Even if you use it completely?

In the bios you can safely switch off that

Always the same temperature is always cool. But yesterday I closed something at task Manager and suddenly gin the CPU from 0.79GHz to 3.56GHz