Looked at it. It seems GNOME are doing dirty hacks, since AFAIK they don’t have tearing control in their compositor.
And game fps is not directly translated to perceived performance on wayland. For example in Xonotic 90-95 fps on wayland feel laggy, but if enable glFinish, I’ll get 80 fps in same area, but game will feel much better. But it causes game to run in 20-30 fps in places and cause more lag there, where it would run 30-60. For context runnung game in X11 without glFinish gets me 110 fps in same area, which feel like 110 fps. Running game in kmsdrm gets me 120 fps in same area.