BF3 PC lags

Thanks for your detailed information about your system. I checked your hardware specs and BF3 should run fine on your system, without any major lag what could give the impression of lag stuttering. It could be related to your internet connection or software (as drivers or the gameclient itself).

I provide you some workarounds, please go through the steps and response if that helped or not.

At first, download and install the latest version of Origin at www.origin.com/download (and make sure you have your Origin account ready as well)
Close the origin client and go directly to you origin folder  C:\Program Files\Origin Games. Run the origin.exe in this folder with a rightclick -> run as administrator. 
This worked out in the most cases, if not, try to deactivate your firewall/antivirus software and/or check the online ports of your connection:

TCP: 80, 443, 9988, 20000-20100, 22990, 17502, 42127
UDP: 3659, 14000-14016, 22990-23006, 25200-25300
For specific instructions on how to open your ports, please visit http://www.portforward.com/ or contact your router manufacturer.

Please check your latest video-card driver and check what version of the origin client is installed on your computer. Install the newest driver for your video card.

Sometimes, this issue can be related to the cloud storage.
Open your Origin client, click on “Show Game Details”. Then you go to the cloud button on BF3 and uncheck the “enable cloud storage for all games” box. Launch the game.
If that helped, you can try to enable the cloud storage after a restart; it might work after with the cloud storage function. Make sure to use the local data when the information box popping up.

Cheers

Basti