This guide will let you know how to Reduce LAG & Turn Off Demand Texture Streaming in Modern Warfare 2.
The first thing you will need to do is boot up your game and then press the options button. After that, select Settings from the top and then click on Graphics.
Under Details & Textures, you have to turn OFF the ON-demand texture screening as it is an issue that your game is lagging because this downloads different things in the background when you are playing the game. But the drawback of turning this off is that your game will not look good and you will not enjoy good graphics. So by turning this ON, you have to change some settings. You need to set the allocated texture cache size to small and make sure that the enable download limit is turned ON. After that, set the daily limit to 1 GB.
