I'm working on a game using Metal. I like to show it off to my friends every once in a while, who always make remarks about how the fps is capped at 60. I can increase preferredFramesPerSecond to 120 or something like that, but it seems as though my fps is still stuck at 60. The maximum that my monitor can do is 60, however, I know that more fps, even with a slower monitor, can help your performance in a game. How do I ignore the maximumFramesPerSecond variable and let my game run with an fps cap bigger than 60?