I am also having an issue with input lag. Running on a laptop with an i7 multi-core processor, with 8gb of ram (dedicated video card with 1gb of ram). I also tried the RenderDeferred setting that Raze mentioned, and it crashes to desktop just like Vladmorik mentions.
This is a game-breaking bug for me, and it comes out to be a waste of 40 dollars. Someone please look into this issue at Larian.
