VM graphical performance is very poor in a variety of distros, even with 3D acceleration enabled
Forgive me if I'm not quite following standard protocol for reporting these issues - I'm new to both Linux desktop systems, GNOME Boxes and reporting issues though these sorts of platforms.
I'm using Fedora 36 with GNOME Wayland as the host, trying to run Ubuntu, Manjaro, Pop_OS and Fedora guests (all running GNOME desktop). Host has an i5-8250 and Intel UHD graphics 620 with a 3000x 2000 display. 8 CPU coresa and 3-4GB ram assigned to each VM. Boxes version 42.3.
I'm finding that graphical performance is really bad, in all of them, even with 3D Acceleration enabled, and nothing else open in the host. 1080p Youtube videos, for example, are extremely choppy for a good 30 seconds and often out of sync with the audio, and dragging windows around the desktop has a notable delay in cursor and window movement. Any sort of interactive graphical website its basically unusable.
If I disable 3D acceleration, the problem worsens to the point that videos are unusable, or the desktop either crashes entirely - so it's definitely actually working in some form when 'on' . spice-vdagent is installed in all guests and I've tried running them in both X11 and Wayland - The ubuntu guests particularly dont like running in Wayland and crash often, the Fedora guest on Wayland, on the other hand, seems to do best of the lot (but still quite bad). Lowering resolution from the native 3000x2000 seems to help a little, but not much. Changing CPU cores or RAM on the guests seems to have no effect.
I don't really even know where to start looking in terms of the cause of this but I don't think it's normal because VirtualBox seems to have no such issues - which is odd because I though KVM had a reputation for better performance.
Thanks very much