Best resolution configurability AND performance options for Windows 10+ guests?

[verulian]

Is there a guide to getting the "best" graphical performance along with highly customizable resolutions from a non-passthrough virtual machine guest of Windows 10 and higher in Proxmox? It seems like the gist is to install the SPICE latest drivers from https://www.spice-space.org/download.html#windows-binaries and then to manually pick RedHat QXL or Virtio GPU. My main goal is to a) get the best performance possible and B) be able to get very custom resolutions so I can have some non-standard wide formats for being able to open more windows in a horizontal layout more easily.

Currently I use Jump Connect with QXL as the driver to get really nice remote access, but I can't seem to get a resolution I want.

For example, I'd like to do something around 2400 x 1080, but I can't seem to get anywhere close:

 

[WebKater]

I would like to bump this question. Similar problem over here.

Windows 11 quest with passtrough RTX4060.
Dual Monitor (drivers correct recognized).
Limit is 1920 x 1080 - that is "ok" but how to "fix" this?
First thought might be a NVIDIA or monitor problem - but I cannot see it.

PVE Display: None, while I dont need "noVNC" or remote for it right now.

I really love PVE but high resolution is missing @passtrough