Search for the line seta com_maxfps . If it’s not there, you can create it.
The original MW3 was optimized for Windows 7. On newer versions of Windows, this can cause a performance "crippling" effect where FPS is halved.
Navigate to the game’s installation folder, usually under players . cod mw3 45 fps fix
Classic MW3 has built-in limits in its configuration files that sometimes default to low values like 40 or 45 FPS.
If you are on a laptop, check the GeForce Experience settings. Whisper Mode is known to cap games at 40 or 45 FPS to keep fans quiet. Search for the line seta com_maxfps
The most common culprit for a fixed frame rate is , which can mistakenly cap your FPS to a fraction of your monitor’s refresh rate if it can't hit the target. Go to Options > Advanced Video . Find the Sync every frame option and set it to No .
Set the value to your monitor’s refresh rate (e.g., seta com_maxfps "144" ) or 0 for unlimited. On newer versions of Windows, this can cause
Open the Nvidia Control Panel , go to Manage 3D Settings , and ensure Max Frame Rate is set to "Off" or your desired limit.