Why does my CPU slow down to under 1ghz?

[Windows 11]

Hello, for a while I have been experiencing issues with my CPU speed dropping drastically and slowing everything down even when usuing Dell's original charger. I have a i7-1165G7 @ 2.80ghz speed and its base speed is 1.69ghz. Whenever I open, close or do something on an app, my CPU drops from over 2.0+ghz to well under 1.0ghz. The same also happens when I try watching a video, my speed would drop to 0.5ghz which makes the video start buffering or really laggy to watch. Though, when I stop watching the video or change tabs, the speed would go back up after a couple seconds. I have even replaced

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