FPS stands for Frames Per Second. This is a measurement of how many times the screen does a full refresh within a second. FPS is a fluid measurement that fluctuates based upon rendering speed, image complexity, refresh rates and more.
There are several factors that contribute to FPS:
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Monitor limitations - The refresh rate of a monitor, measured in hertz (Hz), demonstrates the maximum number of cycles per second. 1Hz is equal to 1 FPS.
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Tearing - The term tearing describes a visual artifact where the monitor shows information from different frames in a single screen.
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Sync technologies - There are several sync technologies that fix tearing: V-sync, AMD Free-Sync, Nvidia G-sync, and more. They all work differently to address the same problem. Check your hardware specs to see which technologies, if any, are compatible with your devices.