If you've been having FPS problems recently, try upping your graphics quality.

I'm not sure if this solution will work for anybody else, but I've been having really bad fps drops mid game. I realised that my game had defaulted back to low settings and when I put them back to medium I'm getting a steady 70 fps.

I'm not sure if his will work for anybody else but I've been seeing a lot of posts about fps issues lately and I thought this could help.