The problem with vsync is if the game would be 59 fps on a 60hz monitor, it's going to be presented at 30 fps because it's going to barely miss the vsync every

The problem with vsync is if the game would be 59 fps on a 60hz monitor, it's going to be presented at 30 fps because it's going to barely miss the vsync every frame. This creates large fps instability when the game runs around the monitor frequency.