I've been playing since beta. Immediately after beta Iw as running max graphics at 50 FPS in combat. When I left I was a bit lower than max but still 30-60 FPS. I took a break and I've come back. The game now runs at 15 FPS when doing nothing at all listing CPU as the bottleneck. I can't switch weapons either, it pulls out the same gun again except now I cannot fire. The CPU is at 42% so It's not even being utilized. What's wrong here? Note: No other game is experiencing framerate issues. Crysis 3 and MWO both run at max 30-60FPS depending on the level of action.
If you have a half decent GPU, notch some of your graphical settings up, it should push some of the load to your GPU, putting less strain on the CPU.
It's a 660. I tried bumping things to high/medium and got the same problem. It's unplayable. I can't understand why, I can still play Titanfall at maximum too X_X
Oh another note, this rig has 200GB of free HDD, 8GB RAM an nvidia GTX 660 and an I7, so it's better than the recommended hardware.
