FPS Drops? (PC)

If you don't have a multicore CPU you can stop reading now, this wont help you.

I was also experiencing FPS drops and I did some researching and discovered that it's caused by Windows 7 and BF4 not cooperating, with regards specifically to Windows "parking" cores that it deems unecessary in order to save power. It is possible to disable this feature, though it requires editing the registry. Don't run away just yet, there are several utilities that make this job easy. After doing this, all of your cores - logical or physical will be available for use when running BF4.

First, verify you have the same issue by loading into BF4 and pressing the ~ key to open the console and type the following;

perfOverlay.drawGraph 1

perfOverlay.drawFps 1

If the graph spikes around the same time you experience the frame drop, then alt tab and open the resource monitor (Task Manager > Performance > Resource Monitor (button near the bottom) > CPU Tab). Down the right hand side you should see individual graphs for each of your cores. If any of them are in a "parked" state, then you have the same issue I did, and should continue reading.

This guide contains the instructions on how to remedy this issue and disable the core parking feature in windows.

http://www.coderbag.com/Programming-C/Disable-CPU-Core-Parking-Utility