Hyper-V Virtual Switch Speed connected to trunked ports

Hi

I have a Hyper-V HA Cluster with three hosts/nodes, all three run Server 2012, All 3 have a 3 physical NIC Team for VM external traffic, I have this team connected to a Cisco 2970 switch which has the corresponding 3 ports on the switch set to trunk ports according to the Network Admin, everything works but file transfer speeds appear slow between VM's and physical servers but physical servers the speeds are as expected from a 1Gb network, should the ports on the switch be aggregated in some way or 3 standalone trunk ports?

I tag the VLAN for each VM at the VM level settings not at Physical switch or Virtual switch level.

Any help on this much appreciated.

Spud!

Spudney