In simple terms, a highly compressed game uses advanced algorithms (like FreeArc or LZMA) to squeeze the original file size down by 50% to 80%. For Modern Warfare 2 , a standard installation is roughly 12 GB. A highly compressed version can shrink that to .

It is important to manage expectations. While the download size is smaller, the installation size usually returns to the game's standard footprint (often 8GB+). Additionally, some highly compressed versions might strip out certain features to save space, such as: