Hello,
No matter if i have unchecked option in nvidia-settings, my compositing manager still doesnt tear. I would like to disable it completely, because of that my gnome 3 performance suffers (when i move windows the window lags behind mouse cursor), and mutter doesnt have any option to disable vsync by its own. So since by default nouveau doesnt have vsync on, I do get tearing in gnome 3, but the performance is very good, and since tearing doesnt bother me much i would like to disable vsync.