I got a question because my friend said he lowered his graphics with editing a file and he said he was doing (almost) the same like this
but BO has a console so is there a way to lower your graphics with the console and is this not banable?
his using cracked BO so he won't get banned...

If you want to drill down a bit further into the game engine, you can edit the game engine settings. You may find anti-cheat software like VAC takes a dim view of this, but there's a couple of flags that are worth playing around with.

The configuration file is called config_mp.cfg, and you'll find it in main installation folder under 'players'. For Steam users, this is 'C:\Program Files (x86)\Steam\steamapps\common\call of duty modern warfare 2\players\' by default.

Open up this document in Notepad and you'll find it's a little harder to edit than cfg files from other games (if you're in the habit of playing around with cfg files that is) because the different settings aren't separated by carriage returns. You can resize the window to force long instructions onto a single line, but ultimately you'll rely on CTRL+F to navigate to different cvars.

A comprehensive list of the variables that make a difference can be found in this excellent forum post, but most of them simply relate to the same options in the in game menu. For example, setting 'seta r_dof_enable' to '0' is the same as turning off depth of field the normal way.

What you can do that the game doesn't allow, though, is turn of anisotropic filtering and the heat shimmer around fire. Do this by changing 'seta r_texFilterAnisoMax' and 'seta r_texFilterAnisoMin' to '1', and 'seta r_distortion' to '0'.

It's good to know the cfg file is there, and better to know that Black Ops will support the dev console, but the most useful change you can make is to change 'seta drawLagometer' to '1'. This brings up a small square which graphs your network throughput and will let you know if you have a spiky server connection, rather than graphics problem affecting your game.

Do remember that editing the config_mp.cfg file is at your own risk, and if you screw it up you can just delete it to restore default settings.

this is a part of a thread from steam : how to speed up your mw2