1. Lower Graphics settings and see if issue is resolved, if not the problem is something else.
2.See if the issue is only with COD or other games, if issue is with other games too try a driver reinstall, if you have rivatuner use driver reset feature.
3.When the game is running open task manager and see if any program consuming much CPU time, usual culprits are AV and auto update.
4.Make a backup and delete savegame folder and create new game.
5.Download furmark and stress your GPU,
thanks for the help...
1. I tried with lower settings but not much fps boost.. only minute.
2. I think this is the issue with only COD games. I play every games with high settings with decent fps without any lad. (except crysis where I get around 25fps)
3. Couldn't find any culprit.
4. Haven't tried it yet. but how does it matter?
5. I dont want to stress the gpu. I played cod4 with the same config without any lag and suddenly this happens...