Friday, December 16, 2011

Modern Warfare 3 (MW3) PC Lags

If Modern Warfare 3 lags on Windows for some reason there are several approaches to try to get rid of it. This article will examine a few of them.
  1. Upgrade Hardware
  2. Download Latest Drivers
  3. Set High Priority
  4. Update Microsoft Visual C++ Redistributable
  5. Stop Unnecessary Background Services
  6. Rename Config_MP.cpg File

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Upgrade Hardware
Until and unless your computer is not meeting the minimum system requirements, MW3 PC lag problem will not be fixed. The solution is simple- upgrade hardware after running a test called Windows Experience Index.
  1. Click Start button on your Taskbar.
  2. Type Windows Experience Index in the Search box.
  3. Press ENTER.
  4. A new dialog will open. Click Rate this computer button.
  5. The test will start. Please stand by until the process is finished.
  6. After the test is finished, final results will appear on your screen. Carefully review the test results and add new hardware accordingly.
Download Latest Drivers
Are you running Modern Warfare 3 on a machine with outdated device drivers? If so, it might be the reason behind MW3 PC lag problem.
Download a driver updater program. Then scan for the latest driver updates and download & install them instantly.
Set High Priority
Lesser the CPU is used more a game will run slower. MW3 PC lag is experienced if the priority of Modern Warfare 3 process is set to Normal or Lower. Reset it to High to get rid of the problem.
  1. Press Ctrl + Alt + Delete.
  2. Select Start Task Manager option.
  3. Click Processes tab.
  4. Right click Modern Warfare 3 executable file and select Set Priority | High.
Update Microsoft Visual C++ Redistributable
Microsoft Visual C++ Redistributable is an essential program used to run Modern Warfare 3. You may experience MW3 PC lag if Visual C++ Redistributable is outdated. Update it by downloading the latest copy from here.
Stop Unnecessary Background Services
Without your knowledge, a number of services run in the background when Modern Warfare 3 is running. Fix MW3 PC lag by stopping most of these unnecessary services. Download a Services Optimizer which does this task automatically for you. Alternative steps are also given below:
  1. Click Start, select Run.
  2. Type Services.msc in the Open box.
  3. Press ENTER.
  4. Right click a services item and select Stop. Do the same for all other unnecessary services.
Rename Config_MP.cpg File
  1. Open My Computer.
  2. Open C:\Program Files\Steam\SteamApps\Common\Call of Duty Modern Warfare 3\Player2
  3. Right click Config_MP.cpg and select Rename.
  4. Type a new name Backup_Config_MP.cpg


  1. great man , i hope it work^^

  2. it said that the folder must be unusable so I clicked no. When I typed in Backup thing

    1. @Jacoby Cantalupo: Sir, please let us know what exactly your question is?

    2. @Jacoby Cantalupo: I guess you are not able to rename the "Config_MP.cpg" file. If my assumption is true then please close the game and try again. Else use a freeware program such as "OpenedFiles View" and end the process using this particular file.


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