How do I change my resolution from high to low or medium, and will that fix my lag problems? Also want to know if this will make my gaming faster? I often see that I get killed by someone before I even see them, but when I watch the replay I can see the whole thing. It's as if they where moving at hyper-speeds

Lowering the resolution makes the game user more CPU than GPU. So basically if you lower the resolution most of the load goes to the CPU and offloading the GPU a bit.

That makes sense. Thanks for that. I have a i7 CPU Q 720 @ 1.60GHz and a NVIDIA GeForce GT 330M 1 GB DDR 5 Dedicated VRAM. Do you suggest lowering it or is this enough to not really make a difference?

I had the same issue with the delay. I lowered mine down to all being on High and found that helped. I also restart my router before playing and disable my antivirus. If I don't do that, I can tell a difference in the lag/speed.

Do you set the res in the game menu?