Vsync should only be disabled when benchmarking so that the videocard and processor are not being limited by the display. Frame rates will appear higher with vsync off but the amount of information displayed is limited by your monitor in that instance. A monitor with an 85 Hz refresh rate will only display 85 frames per second even if the videocard is rendering 400 frames a second. The visual quality may decline as a result also because some frames could be skipped as a result of excess rendering so the interpolation between the first frame and the next frame displayed could be off resulting in 'tearing' or jerkiness.
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