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Oh, I found what causes this issue. If VM allocated vProcessor more than host's physical cores, It's too slowed. (Ex: Host - (4C/8T), VM - 8...
Yeah, It's toooo slow compared to VMWare Fusion which supports nested virtualization with Apple hypervisor. I hope Parallels solve this issue.
I think there are some people who have same issues: https://forum.parallels.com/threads/accessing-to-a-physical-partition-from-a-vm.339850/...
This might be rare situation, But sometimes need to boot Boot Camp with Windows Recovery partitions. (which for BitLocker, Might be creation of...