Question CPU clock speeds going ridiculously low after plugged off

Aug 8, 2021
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I have a LeNovo ideadpad3 and its processor is the i7-10510U.

I have a problem with the clock speeds once my PC is plugged off. When I plug in it goes over 4.2GHz like it's expected to, but once i plug of it goes down. This is a behavior I would expect (to save battery), but I wouldn't expect to go down to 0.8-1.1GHz when its base clock is 2.3GHz. I checked this in the task manager, so first, I would like to know to what extent is the task manager reliable, and if not, how should I fix this, if possible.
 

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