I have setup a Dell T410 equipped with 24GB ram and 2 Quad core Xeon cpus to run Windows 2008 R2 with Hyper-V. I have setup the parent partition OS to use the first Broadcom NIC on the system board and the guest OS which is also running Win2K8 R2 is setup to use an External virtual network which is using one of the 4 NICS on the Intel Quad NIC adapter. File copying between the parent OS and the guest OS is very slow, ~90 kbps/sec. I've disabled all offloading on the NIC settings for both physical NICs and the virtual NIC. I've even tried setting up an Internal virtual network using a separate subnet and I still have throughput problems. Not sure what to try next or where to look. Any help or suggestions are appreciated. I'm pretty new to using Hyper-V but I've read through several MS technet articles and an MS deployment guide as well as Mastering Hyper-V but I have a feeling I'm missing something.