The image below is an example that illustrates what happens when the Frame Rate drops which produces VSync stuttering. This enables each application to decide whether you want to use VSync with it or not. With modern monitors and video cards, VSync is not often as critical an issue (depending of course on the demands of the system and desired results), and for that reason, VSync for most is set to Application Specific in your Video Card's Configuration Manager (for example, the NVIDIA Control Panel). The functionally works by setting an overall Frame Rate based on the video card demands and the Monitor refresh rate this will yield a very harsh jump sometimes between 30 FPS and 60 FPS on modern machines which yield the stuttering effect. VSync essentially is a way to control screen tearing (when the Frame Rate exceeds the Refresh Rate of the monitor) or stutter (when the Frame Rate drops below the Frame Rate Cap, typically 60 FPS) in your rendered application. To better understand how Smooth Frame Rate works, an understanding of Vertical Sync (or VSync) is also needed as the two have a lot in common. The Smooth Frame Rate option (found in the Project Settings under General Settings/Framerate) is enabled by default and can be used to define the min/max acceptable frame rates on a per-application basis.
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