Navigate to the folder: 'program files\steam\steamapps\common\call of duty modern warfare 2\players' and open the file config_mp.cfg. Change scoresping_interval from 100 to 20, and maxbars from 4 to 10 (10 is the max). This means that each of the 10 bars represents 20ms, with full green being 20ms or lower, and 1 red being >200ms or higher.
Use a wired internet connection to fix lag spikes in Call of Duty. If you play on PS4, Xbox, or have a pretty powerful PC, the chances are that your connection problems are caused by internet issues. Ethernet cables use a direct connection to your router to ensure any connection issues stemming from the distance between your console and the by u/LaoFPS in ModernWarfareII. You can try running Scan and Repair on PC and see if it fixes the issue. That’s the only real suggestion offered by official sources right now. Players on console