Find GPUMaxBufferedFrames="0" and try changing it to GPUMaxBufferedFrames="1" .

If you already have the game installed, you don't need to download a new file. You can find and edit your existing one at: C:\Users\[Your Username]\Documents\My Games\Far Cry 4\[Folder with a random ID]\GamerProfile.xml .

This file allows you to tweak settings beyond what is available in the in-game menus, such as disabling mouse acceleration, adjusting the field of view (FOV), or lowering lighting quality to boost FPS on low-end hardware.