Can someone explain this to me - Input lag - Game-to-Game

[spacejunk]

So I bought this 34'' 34UM95-P Monitor a while back, And for the most part I'm happy with it, but what has always boggled my mind is why I get horrendous Input lag in one game and zero Input lag in another ?

In Metro 2033 redux I get the most unbearable input lag, it's like my crosshair is attached to a rubber band, even the mouse Cursor is guilty of this and when I pan left and right quickly I can see noticeable latency.

But in other games like Stalker COP - Misery 2.1, Fallout 3 I get no Input lag at all.

All games are running off a 980 SLI system and have no FPS issues, So I am not mistaking this for poor FPS. Fraps reports a constant 60fps with V-sync enabled and much more without it.

How is this even possible ? I thought Input lag was governed entirely by the monitor response time and refresh rate.

 

[Suzuki@1473780084@1473780163]

Turn off VSync. If you want to get rid of tearing buy a GSync monitor or a 144 Hz monitor without. Response time has nothing to do with input lag.

 

[spacejunk]

I should go into more detail to get a better answer.

Previous to this monitor I had been gaming on a 26" Sony bravia, also a 60hz display, never had one instance of input lag over a 10 year period, V-sync or not.

With the V-sync off, it only alleviates the issue, but it is still noticable, but again, only on some games.

As soon as I bought this monitor, I noticed major Input lag in some games, but none in others.

Why is this ?