![]() Then created an external virtual switch in Hyper-V manager with the teamed network adapter. I used Windows 2012 R2 software-based teaming to team two physical NICs. The Dell R620 server came with 4 numbers of Gigabit network adapters. ![]() The below method helped me to solve the issue and bring back the network speed to normal in Windows 2012 R2 Hyper-V server. During the initial testing time, I noticed a very slow network performance inside the virtual machine guest OS. Installation went smoothly and most of the configuration was done based on Windows 2012 R2 Hyper-V best practice checklist from the Microsoft blog. I installed and configured Windows 2012 R2 Hyper-V on a 3 node cluster with Dell R620 physical servers. It can solve the very slow network performance inside Windows 2012 R2/2016/2019 Hyper-V guest virtual machines. The Windows driver update could fix the issue, but if it doesn’t work, follow this guide to disable the VMQ feature. ![]() Microsoft says that there are particular NICs and manufacturers got affected by this feature. If the physical NIC does not support ( it is a hardware feature) VMQ, then it is going to slow down the network inside the virtual machines. By default, once you install the Windows Hyper-V role on a server, the VMQ feature will be enabled. Update: This method is still applicable for the latest Windows 2019/2022 Hyper-V servers if the physical network cards on the host do not support the VMQ feature.
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