Hey guys, I've been having this issue for quite a while now, and up until this point, assumed certain instances of it was PC performance related. When playing just about any FP game, turning feels really choppy, or "shaky", even when strafing and walking forward or backward are silky smooth. This is a mouse problem. I'm using an MX518 optical gaming mouse(USB). I know it is a mouse problem, because when I plug in my 360 controller, 99% of the time, it eliminates this issue. The game now turns just as smooth as the walking and strafing. I don't know if this is a driver issue, or a hardware issue with the mouse itself, but I do know it's annoying as !@#$. I've tried shutting off any point precision and related settings in windows, to no avail. I removed my logitech drivers and installed windows default mouse drivers. Any game that has a mouse smoothing setting, I have tried to disable or turn down the setting, also to no avail. If anyone knows what is causing this, I would be forever grateful to you, if you could shed some light on this. I know I can just use the controller, but I prefer mouse control if it is possible to get it turning smoothly. Thanks in advance.