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COD4 - tweaks and tips
Improve performance:

cl_maxpackets 100
If you have cable or another highspeed connection, then this setting will smooth out your data.

cl_packetdup 0 or 1
The deafult value of 1 sends extra data packets in case of the first is lost. Enable the lagometer (se tools below), then you can see if you loose packets - if not, change this setting to 0.  

com_maxfps 125
Deafult value is 60 so setting this to a higher value may help overall performance - try it! cg_fov 80 This setting (between 65 to 80) sets the viewing angle of the screen. You will see more of the map, but makes all object small - kinda like viewing widescreen stuff on a standard screen.

pb_sleep 500
Punkbuster sends periodically info from your PC to Punkbuster. Try this setting to tell Punkbuster to wait longer between sending info to Punkbuster. If you want this setting to be permenant, look at the setting below.

pb_writecfg
Stores the above setting, so it's permanent.  

Tools:  

cg_drawFPS 1
Shows your framerate - the higher the better. Must be at least 50-60 for the game to run smooth. If it's below consider decreasing your settings (or invest in a larger graphic cards).  

cg_drawlagometer 1
Top meter: If the graphs is blue (or with a little yellow), then your system is running fine. If it's yellow, then you have a screen/system problem - try updating your graphic files. Bottom meter: Should be mostly green. Lots of yellow and red indicates issues (when you spawn or die, lots of red may occour - this is ok). You may consider changing cl_packetdup to 0 and increase cl_maxpackets.  

If you have more (usefull) tweaks, please let us know mail@number1clan.net .