Very bad gaming experience BF4

Okay guys here's my rig specs so that you can follow up as you read if you want.

Processor Intel(R) Core(TM) i5-3470 CPU @ 3.20GHz
Video Card NVIDIA GeForce GTX 750sc 1 GB vram
Memory 4 GB DDR3
MOBO gigabyte h61m-s2p
Operating System Microsoft Windows 8.1, 64-bit

Now back to my issue, I used to play bf3 on ultra settings @ 60+ fps no problems whatsoever
but then when I started to play Bf4 the gameplay became really frustrating with the fps drops and stutters everywhere. I monitored my cpu, gpu, and memory performances while playing and recognized that my cpu reaches 100 % sometimes, the memory utilizes 3 GB with 500 MB or so standby, and the vram is utilized up to 800-850 MB.

First I thought that the problem is caused by the game's poor optimization but soon after trying every BF4 fix on the internet (one fix that worked for many players was to clear the memorie's cache as you play the game and disable paging), I realized that my hardware may have been the reason of such bad gameplay. Still though I'm not sure which part of my system should I upgrade (is it the processor or the memory?) so I wanted to hear from the experts

Further emphasis on how the game runs (if that's gonna help ) it runs for the first 2-3 mins ok then it starts to stutter for a good 2-3 secs every 20 secs...unplayable of course
also sometimes the stuttering occurs frequently when the game changes maps.

Thanks in advance.


**update**
[video="https://www.youtube.com/watch?v=vnWg1NApyv4"][/video]

I stumbled upon this video while I was looking for a fix
he has the same video card which forces me to believe that the fix that BSOD BSTD
suggested most probably will work in my case
I'll keep you updated when I upgrade my ram

**update2**
I thought these in game graphs might help point out the issue
http://i.imgur.com/DJ8vOqc.png [i.imgur.com]
http://i.imgur.com/d7eSm0F.png [i.imgur.com]
http://i.imgur.com/nzeEXOm.png [i.imgur.com]
http://i.imgur.com/n1Hpoph.png [i.imgur.com]
http://i.imgur.com/B4jutk4.png [i.imgur.com]
http://i.imgur.com/wMXzLfN.png [i.imgur.com]
http://i.imgur.com/fNdfKqR.png [i.imgur.com]
http://i.imgur.com/Ch5Zxbd.png [i.imgur.com]
http://i.imgur.com/OftzSRq.png [i.imgur.com]
http://i.imgur.com/v7U63WQ.png [i.imgur.com]
http://i.imgur.com/mCftZ9G.png [i.imgur.com]
http://i.imgur.com/1rAGCZW.png [i.imgur.com]
http://i.imgur.com/DJAv2Cm.png [i.imgur.com]
http://i.imgur.com/jO4VYPE.png [i.imgur.com]
http://i.imgur.com/dJ2PAGe.png [i.imgur.com]
http://i.imgur.com/HjRD8VZ.png [i.imgur.com]