The Problem

When using FreeBSD based distro’s like TrueNAS-Core or pfSense on Hyper-V network performance is very poor.

The Solution

Receive Segment Coalescing (RSC) is enabled by default on all virtual NICs with Hyper-V and it should be disabled if you are experiencing poor network performance. You can do this with a quick PowerShell command.

Find out if Software RSC is enabled on your virtual NICs:

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Get-VMSwitch -Name * | Select name, *RSC*

Disable Software RSC on a specific virtual NIC:

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Set-VMSwitch -Name "virtual NIC name" -EnableSoftwareRsc $false

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Thanks
-Mike