You want your minimum FPS to be your refresh rate. You won't notice when you're over it, but you likely will if you go below it. In Counter-Strike, smoke grena

You want your minimum FPS to be your refresh rate. You won't notice when you're over it, but you likely will if you go below it. In Counter-Strike, smoke grenades used to (and still do, to an extent) dip your FPS into a slideshow. You want to ensure your opponent can't exploit these things.