I updated to Ubuntu 17.10 a while back and the GNOME performance was fine except for any games. The fps didn't drop but there was a lot of lag when moving up or down or turning around. Everything worked fine in 17.04 but unity works fine in 17.10. All tests using Xorg because I can't run Wayland.
I use an NVidia GTX 960 with 2GB vram, an i5 email@example.com and 16GB system RAM.