I've seen a major bug with people running Kepler and Maxwell Gpu's recently, of which I was a victim as well.
Go into Origin, and disable the in-game overlay. See if this helps. For myself and others this caused a major stall/stutter every 15-30 seconds or so. I encountered this in numerous games until disabling the overlay.
If this has no effect, try running the game with absolutely no OSD, no fraps, no afterburner, nothing monitoring on-screen. The bug is related to this.
