In normal conditions a ESX(i) VM should outrun a WS VM.
If it does not I would check your ESX(i) setup.
Nobody here knows the specs of your VMs. So we can't give good answers here.
I would say that VT is not a big variable in judging performance.
Some VMs must have VT - so there is no question at all.
For those VMs that "can make use of VT" but where it is no "must have" I doubt if it makes a big significant difference
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