Call of Duty 4: Modern Warfare
Game uses heavily modified Quake engine and it's greatly optimized, even older biulds can run it with a steady framerate.
Version Differences
Game is available in retail and later was released on steam. A valid CD-Key is required to play online.
Patches
There are 7 patches but you only need last two.
These two patches are around 300MB in size.
Issues and fixes
Missing d3dx9_43.dll or similar .ddl file
Update or install DirectX.
Tweaks
Game is highly customizable by using console commands. You can enable console in game's options.
Show FPS Counter
- Enable console in options
- Press tilde (~)
- Type in cg_drawFPS 1