massive fps drop

Try the following:

1. Try to reinstall the game.
2. Delete the configuration file settings of the game. (My Documents--folder Battlefield 4)
3. Completely remove and re-install the driver for your graphics card.
4. Check for updates your Windows.
5. Clean the system. (AdvancedSystemCare or CCleaner)
6. Try turning off antivirus.
7. Try disabling the option "Origin in the game"

Also, check the temperature of the GPU and the CPU. And load. This can be done by this program. Here