Hello everyone,
I've been working on macOS virtual machines for some time and recently updated to macOS 15 on a host and its virtual machines.
I have "screen sharing" enabled on everything, host and virtual machines.
When connecting to the macOS 15 host through VNC, everything works fine, video output is alright and responsive.
When connection to the macOS 15 virtual machine, I get a black screen first, and then the video output refreshes at a rate that feels like 1 image every minute. Although inputs seem fine. If if open a VNC session through both the host and the VM, I can see my inputs inside the VM VNC session when looking at the host VNC session (example: moving around windows or typing on the keyboard).
Everything was fine on macOS 14 and prior.
I tried enabling 3D acceleration in Fusion settings, but that doesn't do anything.
As anyone else experienced this ?
There are known networking performance issues in macOS 13 and later guests. macOS 13 and later guests are configured with a VMware vmxnet3 virtual graphics adapter. The driver for this adapter is provided by Apple and contains default settings that perform poorly. Take a look at KB article https://knowledge.broadcom.com/external/article/315599/slow-upload-speed-in-macos-guests-with-v.html and see if the recommendations help.
That was it! Works like a charm after following the recommendations in the KB article.
Thanks a lot for your input.