Right-click the file and select (or move it to your desktop as a backup).
Follow this step-by-step troubleshooting guide to unlock your frame rate and restore smooth performance. 1. Correct In-Game Display and Refresh Settings
Corrupt shader files from a recent game update can severely degrade performance and lock frame rates.
Open Discord settings, go to Game Overlay , and toggle it off to eliminate background rendering conflicts. Hardware and Windows Optimizations
For older Call of Duty titles (like the original 2011 MW3), you could manually tweak config files. For the 2023 Modern Warfare 3 , this is not recommended and can trigger anti-cheat flags. Stick to the official in-game settings. cod mw3 45 fps fix
The "45 FPS Fix" is ultimately a resolution of a window management conflict. By switching to and disabling V-Sync (or relying on G-Sync/FreeSync instead), the user bypasses the Windows DWM bottleneck, allowing the engine to render frames asynchronously and restoring the expected high-performance gameplay experience.
The most common cause of a precise, low FPS cap is a setting in the game's configuration file that overrides in-game menus. : Navigate to Documents\Call of Duty\players .
Change your to Exclusive Fullscreen . (Windowed or Borderless modes often lock your frame rate to background Windows processes).
: Go to Documents\Call of Duty\players and open the file named options.3.cod23.cst (or similar depending on the version). Right-click the file and select (or move it
Locate the file named options.3.cod23.cst (the number may vary slightly based on updates). Cut and paste this file to your Desktop as a backup.
Manually select your monitor's maximum capability (e.g., 144Hz, 240Hz). Adjust Custom Frame Rate Limits Locate the setting. Set it to Custom . Expand the advanced options.
If you can tell me your and GPU specs, I can help give you more specific settings for your hardware. Would you also like a guide on how to reduce packet burst , which can feel like low FPS? AI responses may include mistakes. Learn more COD: Modern Warfare 3 Lag Fix and FPS Boost 2026
Reports of Call of Duty: Modern Warfare 3 (MW3) being stuck at 45 FPS are often tied to specific settings, hardware-specific features like Resizable Bar , or unoptimized config files . Users encountering this exact 45 FPS cap should prioritize the following technical adjustments. 1. Disable Eco Mode Caps Correct In-Game Display and Refresh Settings Corrupt shader
Turn this Off or set to Low. This is one of the most demanding graphical settings.
A 45 FPS lock in Modern Warfare 3 is almost always solvable. The most common fix is simply disabling V-Sync and setting a custom framerate cap. If that doesn't work, the problem is either a hidden cap in your GPU software or a hardware bottleneck caused by high graphics settings.
Restart MW3. This forces the engine to better utilize your GPU. Fix B: Disable "Real-Time Protection" (2026 Update)