Yep, I'm having the same issue. Really annoying.

I had the same problem. Unsure what it was caused by but I seemed to have fix it. It has something to do with a program running in the background. I think it was EA's Origin client. Try closing off programs until it stops.

Programs set to High Priority will probably cause this. Even when they are not CPU intensive.

MW3 seems to automatically set it's own priority to High, setting it to normal or anything else than High, seems to cause slight stutter.

I use Mumble, and it sets it's own priority to High too, and when unsetting that, it's fixed.

So, CPU intensive tasks, close them, high priority tasks, lower the priority to normal, or low to ease it out.

Yeah, I have this problem aswell. Im not even gonna bother to touch this so called "new game", before its fixed.

Bump. Get one of these IW employees in here, maybe we can get a respond.

Anyone one with the opposite ?  

You can fire but not turn ?

Hmm.. When I turn the vsync on and set refresh rate to 60.. there is gonna be latency when turning.. but If i set hz to 75 and vsync on.. it doesn effective right? but it helps dunno why..

But they really should unlock com_maxfps.

I stopped playing for a couple days as I mentioned before it's nearly impossible anyway. Tried again yesterday and things were fine with no problems at all. I thought they fixed the problem until I tried again today and the problem was back again. I didn't do anything specific when it worked so it seems as others have mentioned that it will randomly work/not work. It's not FRAPS or at least not for me as I have never installed it on this machine.

I really hope IW fixes this soon.

I just started having this random jerky mouse issue. I've read through this entire post and  have  yet to find a fix. I'm using a Death Adder 3.5G if that helps. I haven't tried using another because I'm to lazy and I feel that may not solve due to this is the only game that gives me the random jerky mouse effect. Since writing here I will try another mouse to see if I get different resualts.

I actually know the reasons why we get that random mouse sensitivity increase.

a) to high USB polling rate

• I had 1000 and lowering it to 250 actually helped a bit.

b) a process in the background has a "high" or "higher than normal" priority

• Fraps sets its own priority to high as an example.
• winlogon.exe and csrss.exe do that too.
• I cant set their priority to normal yet, but I'm working on it.

c) to low fps

• the fps is locked to 90, but there is already an unlocker.
• http://youtu.be/PpW_0A0GOUg 
• I used to have 250fps steady with the filmtweaks, now I'm stuck at 160fps,
• but still that helps a lot. I guess it can be anything thats not below 125fps.
• I had no acceleration bugs at that time. It MUST be something steady
• or else the acceleration will occur when your fps drops or increases.

You can use FPS configs for more fps, I actually got an increase with that.

Run Fraps and the FPS Unlocker at the same time.

Fraps will have 2 processes, one of them has its priority at normal already,

but you can change the other one. So you will need to close and reopen it alot.

Put in 251 to unlock your fps completely and check Fraps' fps overlay.

I'd suggest you to try it our on Outpost, because of the snow.

Throw down a smoke, explode some barrels and check your fps.

Look at the minimum and lock it to that, hopefully you'll have more than 125. :|

I'm still trying to get myself those 333 fps

which gives you a small but significantly higher jump, better firerates and less steps.

I hope I could help atleast some of you.