How can I run bf3 more smoothly (at high settings)?

I'm currently able to play battlefield 3 but I want to know why I can't play the game at high settings without getting choppy play (when I move my mouse...its not major lag but it is a bit noticable especially in maps like caspian border).

My question is this: I play at the medium settings that the game offers and it runs smoothly but I want to know if I can improve my fps at the high setting the game offers by changing some stuff around (like anti-aliasing and all that junk that I know nothing about).

Or maybe my hardware won't allow me to do this? Here is what I have:

OS: Windows 7 Home Premium 64-bit
GFX CARD: (I uninstalled GamerOSD and smartdoctor software that came with this...idk if that is good or bad)
RAM: G.Skill Ripjaws Series 8GB (2 X 4GB)

Here are my PC temperatures when idle (I don't know how to check temps when running a game): (my gpu fan is always at 15% when I am not playing games...don't know about in-game fan speed).

CPU, motherboard, and gfx card temps are usually around 40-42 during the summer/fall but now that it's cold they have dropped a bit.

Also note that I play bf3 at my desktops native resolution (1920 x 1080, 60 refresh rate) and that I have done no overclocking to any of my computer parts since I put this PC together (mainly 'cause I am a noob and don't know how).

Sorry for writing a lot but I wanted to include as much information as possible...thx.

PS. How can I check fps in-game?
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More about smoothly high settings
  1. Install this Just open and let him open and play what you want and you will see your FPS in the corner of your screen when you play the game. Im using this to.
    Your computer run good and the temperatures are fine.
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