January 12, 2018 - networking

How-To Fix slow internet speed on a Realtek adapter with Hyper-V machines

Xavier Geerinck

@XavierGeerinck

When working with the awesome Visual Studio Android Emulator, I encountered the following error:

Issue: Internet speed gets divided by a factor of 10x when creating a Hyper-V machine that uses a vSwitch bound on the main Network Interface (nic).

Solution:

Open adapter settings -> Right click towards properties -> Configure your network adapter

Now disable the following settings:

  • IPv4 checksum offload
  • Large Send Offload (IPv4)
  • TDP Checksum Offload IPv4
  • UDP Checksum Offload IPv4

After disabling these settings my internet speed went back to its original speed :) hope this helped!

Note: For people with a Broadcom adapter, I recommend looking after disabling VMQ (Virtual Machines Queue) which seems to be an issue as well

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