Despite having a 1 Gbps Intel network card plugged into a 100Mbps switch, my Link Speed claims 10Gbps. So, while I'm pushing 75Mbps of traffic (copying the vhd file as per previous blog post), it claims a network utilization of 0.75% instead of 75%.
Other co-workers (that happen to have the same kind of machine/card) have also seen this issue, so perhaps it's just an issue with that card's 2008 driver or something.
Maybe it even has to do with the virtual network I have set up for use in HyperV. That seems far less likely, I admit.