Third: you need to forcibly turn off the vertical synchronization of the graphics card.
Fourth: Right click "My Computer", Properties, Advanced, Performance, and select "Best Performance".
Fifth: desktop properties, settings, advanced, monitor, screen refresh rate adjusted to more than 75. What I want to say here is that many friends who play CS will even get a screen refresh rate of 200, which is actually unnecessary, because when the screen refresh rate is above 75, people's naked eyes can't tell the screen fluency.