HOW TO USE! These are my configuration settings within Black Ops 3 on PC. What you need to do to find this file is navigate to your local disk (most are the C drive, mine is the E drive since I have multiple hard drives) it'll look something like this:

E:\SteamLibrary\steamapps\common\Call of Duty Black Ops III\players

Once you're in there ^ click on the "config" file (I recommend opening it up with notepad++ so you can read things easier). Once you're in here copy EVERYTHING below this line and paste it. If it still doesn't work, fiddle around with some settings until you get your desired performance. MUCH LOVE <3

//
//Gameplay
//

//Frame rate cap (0 for none)
MaxFPS = "0" // 0 to 1000

//Show current framerate on screen
DrawFPS = "0" // 0 or 1

//Toggle framerate smoothing
SmoothFramerate = "0" // 0 or 1

//Horizontal field of view in degrees assuming 16:9 aspect ratio
FOV = "110" // 65 to 120

SplitscreenOrientation = "0" // 0 or 1

//Enable network voice chat
VoiceChat = "1" // 0 or 1

//Enable occlusion of sound behind solid surfaces
SoundOcclusion = "1" // 0 or 1

//Mouse smoothing amount
MouseFilter = "0" // 0 to 10

MouseAcceleration = "0" // 0 to 1

MouseSensitivity = "2.8" // 0.1 to 30

//Mouse vertical sensitivity
MouseVerticalSensitivity = "0.022" // -1 to 1

//Enable vertical look with the mouse
MouseVerticalLook = "1" // 0 or 1

//Maximum number of simultaneous human corpses
CorpseCount = "1" // 1 to 32

//Number of frames the driver is allowed to enqueue, a lower value improves input latency but may decrease performance. Set it to 0 to use the system default, usually 3.
MaxFrameLatency = "0" // 0 to 4

//0 use two threads, one thread update frame N while the second render N-1. 1 concatenate update and render. 2 concatenate update render and frame presentation.
//0 is the default for the best performance, 1 and 2 improve latency but require a powerful CPU.
SerializeRender = "2" // 0 to 2

//
//Setup
//

//Set to zero to force auto-detect to run at startup
AutoDetectHasRun = "1" // 0 or 1

//Clear to check driver against recommended
LastDriverNvidia = "36175" // 0 or bigger

//Clear to check driver against recommended
LastDriverAMD = "0" // 0 or bigger

//Fraction of video memory usage to target
VideoMemory = "1" // 0.75 to 1

//Hide graphics options that are too demanding for the user's video card
RestrictGraphicsOptions = "0" // 0 or 1

//
//Display
//

// 0 - Windowed, 1 - Fullscreen, 2 - Fullscreen Window
FullScreenMode = "2" // 0 to 2

//Window X position
WindowX = "0" // -8192 to 8192

//Window Y position
WindowY = "0" // -8192 to 8192

WindowSize = "1920x1080" // any text

RefreshRate = "144.001" // 1 to 240

//Monitor index to use for fullscreen
Monitor = "1" // 0 to 8

//Vsync only applies in fullscreen
Vsync = "0" // 0 or 1

//Percentage of window resolution that the 3D scene renders at
ResolutionPercent = "100" // 50 to 200

//Color spaces for monitor output
DisplayGamma = "sRGB" //  sRGB, rec.709, or rec.709 - Limited

//Set to 3 to enable triple buffering, useful to prevent large framerate drops when vsync is enabled
BackbufferCount = "2" // 2 to 3

//
//Graphics
//

//LOD's to drop on models, lower numbers are higher quality
MeshQuality = "0" // 0 to 2

//0 - Force 2x anisotropic filtering, 1 - Per material, 2 - Force 16x anisotropic filtering
TextureFilter = "2" // 0 to 2

//Number of mips to drop on streamed textures, lower numbers are higher quality
TextureQuality = "0" // 0 to 3

//Number of mips to drop on effects and dynamic decals, lower numbers are higher quality
TextureQualityFX = "0" // 0 to 15

//Number of mips to drop on reflections, lower numbers are higher quality
TextureQualityProbes = "0" // 0 to 16

//Number of mips to drop on sun shadows, lower numbers are higher quality
TextureQualityBakedSunShadows = "0" // 0 to 2

//Force lowest mips to stay loaded instead of streaming
TextureLowDetailResident = "1" // 0 or 1

DisableDynamicLightShadows = "0" // 0 or 1

DisableDynamicSunShadows = "0" // 0 or 1

//Resolution of spot light shadows
SpotShadowTextureSize = "4096" // 128 to 8192

//Resolution of omni (point) light shadows
OmniShadowTextureSize = "512" // 128 to 2048

//Enable multi-sampled soft shadows
ShadowFiltering = "1" // 0 or 1

//Number of lights with otherwise static shadows to force characters shadows on
ActorShadows = "8" // 0 to 16

//Enable volumetric sun and light shafts
VolumetricLightingEnabled = "1" // 0 or 1

//Number of raymarch samples for sunlight
VolumetricLightingMaxSunSamples = "40" // 1 to 256

//Number of raymarch samples for local lights
VolumetricLightingMaxLightSamples = "80" // 1 to 256

//Skip every other sample if color is constant
VolumetricLightingSkipSunSamples = "0" // 0 or 1

//Skip every other sample if color is constant
VolumetricLightingSkipLightSamples = "0" // 0 or 1

//Enabled order-independent transparency
OIT = "1" // 0 or 1

//Maximum number of overlapping transparency layers
OITLayers = "16" //  8, 9, 12, or 16

//Screen-space ambient occlusion method
SSAOTechnique = "GTAO Ultra Quality" //  Disabled, HEMIAO, GTAO Low Quality, GTAO Medium Quality, GTAO High Quality, or GTAO Ultra Quality

//Anti-aliasing technique
AATechnique = "SMAA 1x" //  None, FXAA, SMAA 1x, Filmic SMAA 1x, SMAA T2x, or Filmic SMAA T2x

//Per-object motion blur
MotionBlur = "On" //  Off, Auto, or On

MotionBlurQuality = "High" //  Low, Medium, or High

//Better lighting for skin
SubsurfaceScattering = "1" // 0 or 1

//If true, the game will switch back to fullscreen once it get back the focus after losing it on Alt+Tab or similar events. If false, the game stay window and can be switch back to fullscreen with Alt+Enter
AutoRestoreFullscreen = "1" // 0 or 1

//Set to 1 or 2 to display an ingame overlay of the frame performance over time.
ShowPerformanceGraph = "0" // 0 to 16