Low CPU Frequency

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Low CPU Frequency

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I have Dell Latitude 5500, Win11, CPU i7-8665U. From time to time CPU is going to very low frequency (0.6-0.7GHz, when nominal is 1.91GHz. And it happens randomly, meaning if the load is high (being plugged in). As a consequence, everything is lagging heavily. I've mentioned, that if I set power saving mode on and then off quickly, it help get back to high frequency.

Is it a cpu issue or am I missing smth in setup?

Thanks

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Low CPU Frequency

Intel® Core™ Processors