I'm running an iMac with a 2.8 GHz Intel Core i7 with 12 GB of DDR3 on OS X 10.9.5 and am getting tearing with playing CS:GO. I'd like to fix this. How can I disable Vsync in 10.9.5? What does this have to do with Beamsync?


CS:GO respects its own Vsync setting, which works while in fullscreen. You can edit this in the Video options:

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Enabling this setting will prevent screen tearing, at the cost of performance. Typically, this is undesirable in a competitive game like CS:GO, but there's nothing stopping you.

Beamsync is Apple's implementation of Vsync, present in the normal desktop environment and, by default, most apps. As of OS X Mavericks, the ability to enable/disable it was accessible through the Graphics Tools for Xcode:

Note that these changes are not permanent.

At some point however, this appears to have changed: disabling Beam Sync is no longer available through the Graphics Tools. Some tools (1 and 2) claim to disable it, but I haven't verified their integrity, and neither have been updated since 2015.

My recommendation given your use case is to just keep CS:GO in fullscreen and use their implementation of Vsync, toggling as you see fit.

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