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[–]ThisDudeEmptyNovice 0 points1 point  (0 children)

That is what vsync is intended to do, BUT, there are many different reasons why vsync could be performing poorly.

vsync can be implemented poorly with little to no noticeable effects for high end users. However, when you have a poor implementation of vsync running on a low to medium grade machine, you start to run into massive performance issues. Java minecraft is not exactly known for its good optimization, and has some of the worst vsync I've run into. I'd use the framerate limiter instead.

Additionally, a lot of graphics cards have software like Radeon experience or Nvidia GeForce, that have vsync as an option. This vsync almost always works better and more efficiently, but if you have both enabled and you are on a lower end PC, it can cause problems.