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Performance Impact of V-Sync?


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Vsync means a frame won't be rendered until the monitor is ready to display it, which means that if the monitor refreshes every 10ms and it takes 11ms to render a new frame then you'll only see a new frame on screen every 20ms. If you're seeing 30 FPS then your system is probably not quite capable of hitting 60 fps so it ends up halving the frame rate since each new frame is slightly too late for the next refresh and then waits for the refresh after that one

In practice you'll see exactly what you'd see with vsync disabled but it'll avoid rendering more often than it can sync with the monitor.

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