Input lag when Vsync is on

[jermin]

After I turned on Vsync and triple buffer in the my Nvidia Control Panel, I was experiencing mouse lag both in the main menu and in the game. The cursor moved around 1 second behind the mouse movement. Not only the mouse was lagged, but joystick input (axes, buttons) and TrackIR Input was also delayed for about 1 second.

All these have resulted in very poor aircraft performance in the game. Actually I didn't discover it until several days ago. I even started to think that other online players were using cheats, because I was unable to keep up with an enemy in the same plane in a level turn. He would usually get into firing position in less than 2 full-circle turns.

Actually I have been flying like this for about 2 years. You can imagine how frustrated I had been. I always felt that the joystick in the cockpit moveed behind the real joystick I was using. But I tried to persuade myself that it was merely illusion.

Until several days ago, when I turned off the triple buffer (I can still run IL2 with FPS fixed at 75 with triple buffer off), I was like playing a brand new game. All planes responded MUCH faster (bank, pitch, yaw, throttle). I was able do tight turns very quickly. Then I tweaked my video card further by setting Maximum pre-rendered frames to 0. The result was even better.

I've been playing with this setting for a few days. But I still can feel the mouse lag (around 0.2 second) in the main menu and the game. And I'm afraid other input devices are still suffering from the delay. I tried firing MK108 shot by shot. And I could feel the delay between the trigger action and cannon firing. As you know, a 0.2 second delay of firing during a high-speed deflection shot will result in much longer aiming lead, especially for cannons with low muzzle velocity.

However, there wasn't any input lag when I turned vsync off. But horrible screen tearing makes the game unplayable.

Is there any way to eliminate the input lag while enabling vsync?