r_vsync command

r_vsync 0 or 1
Command effect
This command will disable vsynce, which will improve game performance. Turn off vsync 0 to increase frames per second, which may negatively impact performance.
1 On
0 Off
r_vsync 1

How to enter a cheat code

Cheat codes are entered in the console. Open the console by pressing the § / ~ / ` key, which is usually located in the upper-left corner of the keyboard. Enter the cheat code and press the Enter key.

This cheat is only available after you add -devmode to the "SET LAUNCH OPTIONS..." section in the Steam properties of the game.