FPS drop proplem

Give this a try...

Run the game as Administrator:
Go to the Origin games folder (C:\Program Files (x64)\Origin Games\Battlefield 4) and find Bf4.exe. Right click it and go to PROPERTIES, then COMPATIBILITY and check the box next to RUN THIS PROGRAM AS ADMINISTRATOR.
Do the same with BF4_x86.exe as well.

Run Origin as Administrator:
Go to C:\Program Files (x86)\Origin and right click on Origin.exe and go to properties. Then go to compatibility tab and check the box next to RUN AS ADMIN.

Disable Origin in game:
In Origin - Application settings - Origin in Game - disable Origin in game

Origin Cloud Storage turn it off
Origin, settings, General

Make Sure BF4 is set to 64bit if your windows is 64bit
1- open origin and go to My Games
2-Right click BF4 and go to Game Properties
3-Under when launching this game set it to x64 and check off disable origin in game.
4- Hit apply REBOOT your PC and then test your BF4

Reboot PC test BF4

Another thing that may be worth trying: run a Clean Boot: http://help.ea.com/en/article/how-to-clean-boot-your-pc/
This should ensure that no programs are interfering in the background.

Programs to make issues in BF4 see below...

Disable Mantle if you have it and try Direct X, Turn OFF Anti-Aliasing Deferred in video card settings in game. If you have page file turned off then turn it back on as this can make errors even with 32gigs ram.

Others have said if they uninstall MSI Afterburner issues / crashing is stopped. So if you have this installed remove program and test BF4. Also look at other programs as Razer synapse,Razer Cortex, Qualcomm Killer Service ,Fraps,EVGA Precision, Geforce experience, be sure to turn off the streaming function that is enabled by default ,Raptr, RivaTuner , ASRock eXtreme Tuner, Steam, Skype, aero ,Overwolf extra program in teamspeak and xfire are known to make issues as well. And I am sure more programs not in my list yet turn one off at a time and test BF4. Since last patch more programs now give issues :/

Uninstall the HD Audio Driver from the video card driver install add/remove programs. This silly thing makes issues in BF4 for some. Reboot then repair BF4 to be safe.

For video card settings try this...

Nvidia BF4 settings ....

First step open Nvidia Control panel under 3D settings go to Adjust image settings with preview

Pick use my preference and set it to performance and hit apply.

Next go to Manage 3D settings, Program settings tab and add BF4

Once BF4 is added in Program settings tab make sure all this is in place..

Ambient occlusion- not supported
Anisotropic filtering- use global settings off
Antialiasing - FXAA - not supported
Antialiasing- Gamma correction- use global settings on
Antialiasing-Mode - use global settings off
Antialiasing- setting - use global settings none
Antialiasing- Transparency - use global settings off
CUDA- GPU's - use global settings ALL
Maximum pre-rendered frames - Use the 3D application setting
Multi display /mixed GPU acceleration- set to what your display is
Power management mode- Prefer Maximum Performance
Shader Cache- use global settings on
Texture filtering - Anisotropic sample Opti.... - use global settings on
Texture filtering- Negative LOD bias - use global setting Allow
Texture filtering - Quality - use global setting Quality
Texture filtering - Trilinear optimization - use global settings on
Thread optimization - use global setting Auto
Triple buffering - use global settings off
Vetical Sync - use global settings off
Virtual Reality pre-rendered frames - use global settings 1

in game video settings right side set to custom and set everything to medium but last three turn them off ....

1-antialiasing deferred off
2-antialiasing post off
3-ambient occlusion off

on left side be sure vertical sync is off

To see FPS in game with out fraps etc:
1- open note pad
2-put this in the note pad..... perfoverlay.drawfps 1
3-when you make the user.cfg in notepad,change the file type from text to all. And name it user.cfg
4-Put in .....:\Program Files(x86)\Origin Games\Battlefield 4
5-Also close Origin to put cfg in just to be safe :}
6-You will see your FPS in top right of screen when you start BF4