X11 has about 9 billion configurations, some of which have v-sync, some of which don't, and some of which depend on something like how broken your drivers are.

X11 has about 9 billion configurations, some of which have v-sync, some of which don't, and some of which depend on something like how broken your drivers are. I don't normally use any of this fancy compositing stuff let alone anything from gnome, but on a lab machine I have Ubuntu 20 (gnome / X11), and from moving the window around you can clearly see vsync is off.