A recent post on the Dota 2 forums has revealed that Valve is testing a new experimental feature aimed at cutting down latency for users that have the VSync option enabled. With Dota 2 being at the forefront of competitive gaming, any reduction in the effect of latency will surely be well received.
Valve’s Jay Stelly had this to say about the introduction of the new feature:
“Dota 2 includes an experimental feature that allows you to enable VSync with minimal latency. Normally enabling VSync adds another frame of latency causing some inputs to feel delayed. With this new feature the engine will attempt to schedule simulation and rendering to coincide with the start of the new frame on your monitor. It is experimental currently and only available as a console variable. We will add it to the main UI if it is successful for enough users. It requires a PC that can maintain a framerate higher than your refresh rate (usually 60 frames per second or higher).
If you want to try it, enable VSync in the video options panel. Then open the console and set this variable:
You can toggle it on and off to see how it improves your latency.
To turn it back off use the setting: