Take a look at this:
https://www.scirra.com/blog/83/optimisa ... -your-time
Particularly this:
Firstly, the most important performance indicator of a game is its frames per second (FPS) rate. Most modern displays update at 60 Hz, so the target of the game is to run at 60 FPS, so each time the display updates there is a new frame of the game to show. If the game runs faster than 60 FPS, there is no visual improvement! It will simply be drawing a new frame, then replacing it with a newly drawn frame before the display has had the chance to actually show it. So 60 FPS is as fast as it needs to go. That's also why many browsers don't go faster and cap the framerate at 60. Is your game already running at 60 FPS on your target machine? If so, you have nothing to gain by optimising. Nothing whatsoever. It's a waste of time. Why not spend some time improving your gameplay instead?