Hey there... here is a copy of another thread:
...is a method of locking a programs frame rate to your display’s refresh rate. By keeping the frame rate and refresh rate in sync, screen tearing is eliminated. So if you set your display to 60Hz + vSync ON there is no way for you to get more frames than 60 as far as you set your monitor to 60 hz. If you use a 144Hz display and you set it to 144 Hz + vSync ON your upper fps limit will be 144 Hz.
When you disable vSync, your gpu has no limitation and nothing to sync to..so it will pushes out as many fps as it can, but this can cause a screen tearing effect.
And yes... you have to enable V-Sync to rid rid of your issue. You will not notice any remarkable latency while you are playing. It will not limit your computer performance the way you might think. You will be able to use all the glorious power of your system.... Keep in mind... you only need to push 50/60 fps out of your system....there is no 144 Hz Led wall / projector out there as far as I know