This article about optimized settings for Modern Warfare 3 includes quality optimized, balanced optimized, low optimized, and competitive optimized. You can set it up according to your needs. Let you run the game better. The previous article explains the system requirements on a PC, which you can read.
Dynamic Resolution: On (Subjective)
Upscaling/Sharpening: FidelityFX CAS (Subjective)
FidelityFX CAS Strength: 30-100% (Subjective)
Anti-Aliasing: Filmic SMAA T2X
Anti-Aliasing Quality: Normal
VRAM Scale Target: 65-80%
Variable Rate Shading: On
Texture Resolution: Highest VRAM Can Handle
Texture Filter Anisotropic: High
Detail Quality Level: High
Particle Resolution: High (Subjective)
Bullet Impacts: On
Persistent Effects: Off
Shader Quality: Low or Medium (Subjective)
On-Demand Texture Streaming: Off
Streaming Quality: Low
Shadow Quality: Ultra
Screen Space Shadows: High or Off
Ambient Occlusion: Static Objects (GTAO)
GTAO Quality: High
Screen Space Reflections: High or Off
Static Reflection Quality: High
Tessellation: All
Terrain Memory: Max
Volumetric Quality: Medium
Deferred Physics Quality: Off
Weather Grid Volumes: Normal
Water Quality: Off
NVIDIA Reflex Low Latency: On + Boost or Off (Subjective)
Depth Of Field: Off (Subjective)
Word Motion Blur: Off (Subjective)
Weapon Motion Blur: Off (Subjective)
Film Grain: Off (Subjective)
Texture Resolution: Low (Subjective)
Particle Resolution: Low
Shader Quality: Low
Shadow Quality: High
GTAO Quality: Normal
Tessellation: Off
Volumetric Quality: Low
Weather Grid Volumes: Off
Shadow Quality: Normal
Screen Space Shadows: Off
Ambient Occlusion: Off
Screen Space Reflections: Off
Particle Resolution: Low
Ambient Occlusion: Off
Screen Space Reflections: Off
Depth Of Field: Off
Word Motion Blur: Off
Weapon Motion Blur: Off
Film Grain: Off
Disable Steam overlay (possibly other overlays too for different launchers/programs) Steam overlay in this game causes lower than expected GPU utilization thus your GPU is not running at full capacity. To do this right click on the game > go to properties > then disable
Next go into your game and go into Audio > Voice Chat > Game Voice Channel > Then select "Friends Only" or "Party Only". If it's set to anything else it will strain your CPU and cause lag spikes, especially the more talking there is like Warzone
Note: Remember to restart your game if changing "Persistent Damage Layers", "Shader Quality" or "Static Reflection Quality" for it to take affect
29% / 47% / 53% Performance Uplift (Depending on preset)