You could take a look here:
"First add those 2 lines to /etc/environment:
CLUTTER_DEFAULT_FPS=144 #Put your refresh rate
__GL_SYNC_DISPLAY_DEVICE=DP-0 #Mine was DP-0
Then launch Nvidia X Server settings by typing "nvidia-settings" and then disable "Allow Flipping" in the OpenGL menu.
To apply after every reboot, you just need to launch the "nvidia-settings" menu to apply the settings."