OP that happened to me a couple of days ago after the Origin update. Doing a few things solved the problem for me,
1. I disabled Origin in game. To turn off Origin in game log into Origin, in the upper left hand corner click on the word "Origin" in the menu, and then click on "Application Settings". Next go to the "Origin in game" tab and uncheck the "enable Origin in game" box.
2. After BF4 launches I hit ctrl+alt+delete and then I killed origin.exe, don't worry this will not close BF4 even if you receive a warning from Origin
3. I closed my browser too.
After I did these three things my performance graph and FPS numbers were normal in BF4 and I had no more lagging or FPS drops.
