Hello @Rahi Padariya
Welcome to Microsoft Q&A Platform,
I would check if the Hyper-V host is running with the latest firmware and update drivers if needed
If there is any antivirus please remove it and check again
Using Task Manager you can check which are the apps/processes that consuming more CPU in the VMs
Please check the article below for reference:
https://learn.microsoft.com/en-us/archive/blogs/tvoellm/monitoring-hyper-v-performance
If this issue would need remote assistance & collection of logs for further assistance I would request you file a support ticket if you have a support plan.
I hope this helps!
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