Windows server 2019 Hyper-V CPU frequency is too high

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In windows server2019’s Hyper-V, when I choose balance mode in power option, although the load of VM is low, the host machine’s CPU frequency is still in a highly status. But the situation doesn't occur when I choose energy saving mode. Additionally, the situation doesn't occur in windows server 2016.
Is something changed in Power plan in 2019? Or hyper-v has been changed? How to deal with it? Please help me, thanks a lot.
 
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