Forum Discussion
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...
Got a similar issue with a W11 VM on an Intel MBP (MacOS 15.3) with Fusion Pro... Speedtest.net gets me a solid 450-500Mbps upload, but barely half of that in download (???????????), although the host gets 6-700Mbps in download... I played with all possible offloads in the adapter settings (VMXnet3 and e1000), same story, pretty incomprehensible !!
This ended up being my fix on all machines. Run this and it improves the NIC performance. I think it is something to do with the new settings in the network stack itself. https://www.jeffriechers.com/wiki/24h2-windows-11-and-server-2025-vmxnet3-issues/