Very slow upload speeds on Windows 11 (Apple silicon)

DanielM118

Bit poster
Hello,

For the past couple of days, I've been testing Parallels Desktop (trial version) to check if it is a good alternative to other hypervisors. However, I've stumbled upon a network issue that I can't find a fix for.

I've checked other threads (e.g. https://forum.parallels.com/threads/slow-upload-speed-on-win11.355998/ ), but so far I could not find the correct solution.

These are the current specs:
MacBook Pro 16-inch M3 Max 36GB RAM
OS: Sonoma 14.2 (23C64)

Parallels Pro Edition 26.2.2 (57373)
Windows 11 ARM64

The symptoms:
Currently, when I try to use the host (OSX), I can get around 80Mbits download and 30 upload. If I repeat the same test using the Windows 11 VM, I get around 63Mbits download and 3.5Mbits upload. While the Download is more than enough for me to work, the upload is too low.

I tried every solution I could find:
- Tried changing between Bridged and Shared Network, but it didn't work.
- Tried to change the Offload.Tx.LSO. It was already set to "Disabled", but I also tried the IPv4 and Maximum modes, but there was no change in performance.
- Tried to enable and disable the Ethernet adapter. I disabled it via Device Manager and also via the Network & Internet menu. Nothing changed.
- Tried to change the configuration profile for this VM in Parallels, and set it to Gaming, Productivity, and Development. Got the same results.


Maybe I need to execute them in a specific order, maybe this is just another bug. IS there anyone who can shed some light on this?


Performance-wise, everything else seems to be working just fine and I have no complaints, but if I can't fix the network performance then I'll have to give up on parallels.
 
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