Ok, finally tried a Windows 10 VM installed from scratch on Proxmox, taking advantage of the fact that 1809 was released. Also used latest Virtio drivers ISO instead of the one labelled "stable".
I must say, even the aforementioned "fading" effects problem got better. VM is indeed mostly quite usable now. Of course some remaining issues, but more sporadic now.
Guess the previous VM was outdated or lacking space... will never know.
Anyway, thanks all very much again.
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