I passed through my GPU and the SSD to the VM directly. Performance has been solid for me. With 8 cores, 32GB RAM assigned and a GTX 1070. Monitors are plugged directly into the card with the display setting in proxmox set to none since I don’t use the console screen in proxmox for the Windows VM.
Ive been running a gaming VM in proxmox for months now and have really liked it. My base is am old Lenovo ThinkStation P500. Using an old GTX 1070 which is more than enough for what I play. (Minecraft, Factorio, Cities, etc)
I have done streaming too but I used parsec.