Hi there,
It seems the connection goes through some rule that has been created by your Antivirus software that is causing the lag. Try disabling the services and try to access the Hyper V and see if there are some improvements.
You can use the below points to optimize and improve VM performance in a Hyper-V environment:
-Enable Hyper-V Integration Services
-Use fixed VHD files
-Don’t use Hyper-V snapshots as a Hyper-V backup alternative
-Configure the size of paging files
-Do not create too many virtual network switches
-Avoid overloading the management OS
Hyper-V virtual machines exhibit slow startup and shutdown https://learn.microsoft.com/en-us/troubleshoot/windows-server/virtualization/virtual-machines-slow-startup-shutdown
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