Sometimes, the best results come from forcing settings directly through your GPU's control panel.
Check and "Run this program as an administrator" . GPU Management Overrides: cod mw3 45 fps fix
Go to Windows Settings > System > Display > Graphics. Click Default graphics settings and toggle Hardware-accelerated GPU scheduling to On . Restart your PC. Sometimes, the best results come from forcing settings
Corrupt shader files from a recent game update can severely degrade performance and lock frame rates. cod mw3 45 fps fix
Windows might be throttling your hardware or misidentifying your monitor.
: Even if you have DirectX 11 or 12, MW3 (2011) runs on DX9. Ensure your DirectX End-User Runtimes are updated to include legacy files. Advanced Config Tweaks