Windows 10: Very slow up/download speeds with HyperV external switch setup

Discus and support Very slow up/download speeds with HyperV external switch setup in Windows 10 Virtualization to solve the problem; A long standing issue for many Hyper-V users is when you set up an external wifi switch in Hyper-V, it kills the download and/or upload speeds. On my... Discussion in 'Windows 10 Virtualization' started by cereberus, Aug 9, 2021.

  1. cereberus Win User

    Very slow up/download speeds with HyperV external switch setup


    A long standing issue for many Hyper-V users is when you set up an external wifi switch in Hyper-V, it kills the download and/or upload speeds. On my ASUS with an Intel NIC, my uploads and downloads are only 2% of normal speeds making internet virtually useless. The problem does not arise with the default switch but that is behind a NAT which makes it very difficult to RDP direct to VM. I have found a solution that works for me, and I am now back at full speed. Slow download - disable packet coalescing on the wifi card settings in device manager. Slow upload - disable large send offload (for IPV4 and IPV6) from the external vethernet switch that is bridged (not the default vethernet switch). I have no idea if this works for other network adaptors but seems to work for Intel NICs. Source of information (credit to Mike in post #6). virtualization - Creating an external virtual switch on Hyper-V causes host to experience very slow networking - Super User

    :)
     
    cereberus, Aug 9, 2021
    #1
  2. cereberus Win User

    Slow download speed after creating Hyper-V External Virtual Switch

    Have you set the number of cores to 8 in hyer-v settings (virtual processor). No idea otherwise.
     
    cereberus, Aug 9, 2021
    #2
  3. Portugal Win User
    Slow download speed after creating Hyper-V External Virtual Switch

    Hello.
    After buying a new PC (its specs are on my profile), enabling Hyper-V and creating a new External Virtual Switch, I notice that the download speed drops dramatically. My internet conneciton is 1Gbps down and 200Mbps up.

    Without External Virtual Switch:

    Very slow up/download speeds with HyperV external switch setup [​IMG]


    • Iperf with a host on the same LAN (upload 911Mbps, download 777Mbps):

    Very slow up/download speeds with HyperV external switch setup [​IMG]


    Very slow up/download speeds with HyperV external switch setup [​IMG]



    • Lan Speed test (746 Mbps upload and 716 Mbps download):

    Very slow up/download speeds with HyperV external switch setup [​IMG]


    With External Virtual Switch:

    • CPU usage while on Speedtest (notice the first core is fully maxed out):

    Very slow up/download speeds with HyperV external switch setup [​IMG]


    • Lan Speed Test (742 Mbps upload and 596Mbps download):

    Very slow up/download speeds with HyperV external switch setup [​IMG]


    • Iperf with a host on the same LAN (upload 861 Mbps, download 583 Mbps):

    Very slow up/download speeds with HyperV external switch setup [​IMG]


    Very slow up/download speeds with HyperV external switch setup [​IMG]


    • CPU usage while on Iperf (download) - Notice, once again, Core 1 fully maxed out​:

    Very slow up/download speeds with HyperV external switch setup [​IMG]



    Conclusion

    When the External Virtual Switch is enabled, I assume the download speed is lower due to the fact one CPU core is being maxed out, my question is why? Why isn't the load spread throughout the cores?
    Is anyone experiencing a similar issue?

    Regards.
     
    Portugal, Aug 9, 2021
    #3
  4. Very slow up/download speeds with HyperV external switch setup

    Slow downloading speed

    Hi Manthan,

    Regarding your download speed issue, we found a suggestion given by Eeshwar Kumar on our Community page. You can check this link on the suggestion he provided:

    Why is Windows Store's download speed so slow?


    Let us know if you need further assistance.
     
    Anthony Gal, Aug 9, 2021
    #4
Thema:

Very slow up/download speeds with HyperV external switch setup

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