Have you ever wanted to benchmark the graphics performance of your favorite Mac apps and games, or measure the refresh rates of macOS's user interface?
If so, you'll be delighted to learn that Apple provides a free application, called Quartz Debug, which has a built-in live frame rate monitoring tool that can measure the refresh rate of the graphics subsystem in frames per second (FPS).
Here's how you can download Quartz Debug to your Mac and use it to display the number of screen updates per second, see the FPS and CPU gauges changing as you perform different actions on your Mac, enable HiDPI display modes on non-Retina Macs and adjust other settings related to the computer's GPU.