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VMXnet3 Server 2025 performance issues
Had an odd one crop up today. I updated my Server 2025 template to the 26063.1 release and then sysprepped it. Converted it back to a new VM and network performance was .25 Mbps down. Both on my l...
As a data point, my customer was experiencing this after upgrading Win10 to Win11. We were able to resolve it by changing "TCP Checksum Offload (IPv4)" to disabled on the vmxnet3 NIC. We're continuing troubleshooting and I've bookmarked this thread to come back and add more data when we get to the bottom of it.
Their VMs have the NIC named "Ethernet0", so this PowerShell command does the needful.
Set-NetAdapterAdvancedProperty -Name "Ethernet0" -DisplayName "TCP Checksum Offload (IPv4)" -DisplayValue "Disabled"