Looking-Glass is going quite well for me so far, but I noticed that in games I have a lag every few seconds. When I run the VM directly over the Guest GPU everything is smooth.
Host CPU: Ryzen 5 2600X
Host GPU:Geforce GTX 1060
Guest GPU: AMD RX 570 4G
Host Kernel version: 5.4.18-1-MANJARO
Host QEMU version: 4.2.0-1