If in-game settings aren't enough, a hidden configuration file can unlock significant performance gains. This tweak forces the game to use the correct number of CPU cores.
In-game energy-saving settings intentionally throttle performance when menus are idle, but the restriction can bug out and bleed into live matches.
Turn these Off or set to Low.
If the 45 FPS cap is accompanied by stuttering, it is often due to shader installation issues. A. Reinstall Shaders Go to > Graphics . Select Restart Shader Optimization .
Ultimate Guide to Fix Call of Duty: MW3 45 FPS Cap and Drops cod mw3 45 fps fix
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Sometimes external software imposes a cap that overrides your in-game settings. If in-game settings aren't enough, a hidden configuration
Disable the in-game overlay and instant replay features.
Windows 11 automatically lowers refresh rate on some laptops/desktops to save power. Turn these Off or set to Low
Classic MW3 has built-in limits in its configuration files that sometimes default to low values like 40 or 45 FPS.