Input lag when Vsync is on

[von Pilsner]

Originally Posted by {HVY-E}Jinxx

Enabling Vsync DOES NOT CAUSE LAG!!!!

Triplebuffer can cause input lag.

From: http://www.tweakguides.com/Graphics_10.html

[triplebuffering] can introduce control lag. This manifests itself as a noticeable lag between when you issue a command to your PC and the effects of it being shown on screen. This may be primarily due to the nature of VSync itself and/or some systems being low on Video RAM due to the extra memory overhead of Triple Buffering.

However it appears that most recent graphics cards and most new games will not experience major problems by enabling Triple Buffering. Given the fact that it can help to both remove tearing while also preventing the significant FPS drop encountered when VSync is enabled, it is at least worth trying for yourself to see the results on your system.