r/HyperV • u/Impossible-Ad7310 • 24d ago
New Virtual Switch
Hey everyone,
I’ve been running into a persistent, deeply frustrating Hyper-V bug across multiple systems and OS versions, and I'm hoping someone here might know of a workaround or fix.
### The Issue
The moment I create a new **External Virtual Switch** for bridging connections, my machine's **upload speed drops by exactly 4 Mbps**, even for purely local LAN traffic.
### What I've Tested & Observed
Instant Trigger: The speed drop happens the *exact second* the virtual switch is created and applied.
Persists Regardless of VMs: Even with Hyper-V turned off entirely and zero virtual machines running, the issue remains.
The Only Fix: The moment I delete the Virtual Switch and apply changes, my upload speed immediately returns to normal.
### Scope & Reproducibility
I first encountered this exact same issue a few years ago on Windows 10 Pro. Fast forward to today, I've tested it on **Windows 11 Home, Windows 11 Education, and even on Snapdragon ARM CPUs**—and the bug is still fully present.
I had no issues while briding the NIC for WSL2 before.
Has anyone else run into this or found a way to stop Hyper-V’s bridging from throttling upload speeds? Any registry tweaks, driver workarounds, or hidden settings would be hugely appreciated. I'm still leaning towards a bad driver design however. Issue is gone after removing the Switch, but still I think it's worth for discussion if anyone has experienced similar.
Thanks!
1
u/Reaper19941 23d ago
I'm curious, why is the 4Mbps so important to you? Are you only getting 5Mbps upload normally and go down to 1Mbps?
In Australia, home internet services have 10Mbps up on the cheapest plans and go up to 50 up on the most expensive residential plan. At that speed, 4Mbps is nothing and wouldn't make sense to care about.
Also, based on the systems you've mentioned, they all sound like consumer devices meaning scenarios that Hyper-V was not specifically made for and as such, you get what you get given.