vsync ist eigentlich unter OS X immer an.
Ausschalten liesse es sich so:
Download Graphics Tools for Xcode
Install or just mount Graphic Tools
Open Quartz Debug
Go to Tools -> Show Beam Sync Tools
Select Disable Beam Synchronisation
It is not permanent!
https://discussions.apple.com/message/2962693#discussion-2959446
Terminal
http://www.insanelymac.com/forum/topic/11550-how-to-enable-quartz-2d-extreme-and-disable-beamsync/
sudo defaults write /Library/Preferences/com.apple.windowserver Compositor -dict deferredUpdates 0
(to re-enable it, change "0" to "1")
Download Graphics Tools for Xcode
Install or just mount Graphic Tools
Open Quartz Debug
Go to Tools -> Show Beam Sync Tools
Select Disable Beam Synchronisation
It is not permanent!
https://discussions.apple.com/message/2962693#discussion-2959446
Terminal
http://www.insanelymac.com/forum/topic/11550-how-to-enable-quartz-2d-extreme-and-disable-beamsync/
sudo defaults write /Library/Preferences/com.apple.windowserver Compositor -dict deferredUpdates 0
(to re-enable it, change "0" to "1")