Same problem for me, runs at 60 fps (low settings) smoothly then drops to 30-20 fps all of a sudden...even in the test range. This got worst with the new patch, i tried everything, i even formatted the pc and made a clean windows 8.1 pro instalation, reinstalled everything including gpu drivers, directx and bf4, and im still getting fps drops in various servers and game situations...its extremely frustrating knowing it used to work better when i bought the game, but now...im beggining regreting my purhcase...and i got the premium edition, pretty big investment and EA is not delivering it...
I tried all the solutions that i could possibly find on the web but nothing seems to work...does anyone have a real fix??????? and EA, do you care for your costumers????
CPU: FX-8350 8 core 4Ghz
GPU: ASUS HD5850 1 Gb (latest ATI drivers 13.12)
RAM: Corsair Vengeance 8 Gb 1866Mhz
OS: Windows 8.1 pro (fully updated)