In the battle (while shooting) the game stutters and lags, so I can`t make good kills. Does somebody else have the problem? But the average frame rate out of shootings is 60 fps.
(Bad english, I know. I am just a german guy -.-)

My System:

AMD Fx4100 3,4 Ghz
8 GB Ram
Nvidia GTX 660 Ti
Windows 7

Turn off AA on the card and put your settings on low and move up for testing.

Settings are already as low as possible.

It's gotta be something on the card settings cuz your cpu should be fine ... 3,4 quad.

I have never had that symptom but i use a 670gtx .... i did turn off the overblown options.

Maybe a RAM problem???

I noticed that putting Particles on low fixes that to a degree for me.

But they are already low

I getting stuttering on the first few kills every match in multiplayer - usually leads to my death.

After the first couple of firefights the stuttering stops and its fine for the rest of the match.