Let me start off by saying this is an awesome script for left for dead 2. Of course I found it on the net and it works like a charm for people with more than 4 gigs of ram and a good decent video card. I did set an attachment for it and you may download has no viruses or you can just copy and paste it. into a notepad and name it autoexec whatever floats your boat.
// *******************************************************************
// * Kaizen's Left 4 Dead 2 Performance Config
// * v1.1 (Nov 21, 2009)
// *******************************************************************
// * Copyright © 2008-2009 Next Level Gamer (www.nextlevelgamer.com)
// * and respective copyright owners. All Rights Reserved.
// *******************************************************************
// * HTTP://WWW.NEXTLEVELGAMER.COM, KAIZEN AND ALL AFFILAITE PARTIES
// * ASSUME NO LIABILITY FOR DAMAGES INCURRED DIRECTLY OR INDIRECTLY
// * AS A RESULT OF ERRORS, OMISSIONS OR DISCREPANCIES FOUND WITHIN
// * ANY VERSION OF KAIZEN'S LEFT 4 DEAD 2 PERFORMANCE CONFIG. USE
// * OF THIS CONFIG IS ENTIRELY AT YOUR OWN RISK
// *******************************************************************
//
//
//
// INTRODUCTION
// *******************************************************************
// Kaizen's L4D2 performance config is designed to boost your frame
// rates (FPS) while maintaining the best possible graphics experience.
// It also attempts to improve hit registration (i.e. the accuracy of
// your shots) by optimizing network settings, improve the visibility
// of the crosshair, and increase brightness so you can see enemies
// better.
//
// Unfortunately, as was the case with the original L4D, L4D2
// restricts most of the Source Engine's console commands. Many of the
// best performance options can only accessed via the in game menu's.
// Feel free to tweak any of the settings to your liking, descriptions
// of what commands do are provided.
//
// If you have any suggestions, questions or other feedback please
// visit www.nextlevelgamer.com and post on the forums.
//
//
// Enjoy!
// - Kaizen (kaizen@nextlevelgamer.com)
//
//
//
// INSTALLATION INSTRUCTIONS
// *******************************************************************
// Place this file (autoexec.cfg) into your Left 4 Dead 2 CFG folder,
// similar to the path below:
//
// <install folder>\Steam\SteamApps\common\left 4 dead 2\left4dead2\cfg\
//
//
//
// STEAM LAUNCH OPTIONS
// *******************************************************************
//
// For an additional performance boost, customize your command line
// launch options for Left 4 Dead 2 in Steam before starting the game
//
// Setting Launch Options
// ¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯
// 1. Go to "My Games" in Steam
// 2. Right click "Left 4 Dead 2" and select "Properties"
// 3. Select "Set launch options..." and enter the following:
//
// -w 1680 -console -refresh 120 -heapsize 1572864 -high -noforcemaccel -noforcemparms -noipx -nojoy
//
//
// Customizing Launch Options
// ¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯
// -w 1680 Sets resolution to 1680x1050; for 16:10 widescreen monitors - tweak as necessary
// -console Enables developer console; so you can press ~ to enter commands
// -novid Disables the intro movie, speeds up game on start-up (doesn't seem to work in L4D2 yet though)
// -refresh 120 Forces 120hz/120fps refresh rate on monitor (if available)
// -heapsize 1572864 Allocates RAM for the game; see table below for calculating optimal values
// -high Forces high CPU priority
// -noforcemaccel Forces desktop mouse acceleration settings
// -noforcemparms Forces desktop mouse button configuration
// -noipx Disables IPX network detection, local LAN (slight boot time improvement; you may need to remove this for LAN parties)
// -nojoy Disables detection of 3rd party gamepads and controllers (slight boot time improvement)
//
// Heapsize Setting
// ¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯
// Modify the heapsize command to allocate 50% of the RAM you have
// in your computer (NOT video card memory!) in bytes.
//
// Formula = RAM (in GB) * 1024 * 1024 / 2
// 1GB -heapsize 524288
// 2GB -heapsize 1048576
// 3GB+ -heapsize 1572864
//
// Since L4D2 is a 32-bit application it is believed to be capped at
// a maximum of 3GB of RAM. Setting heapsize to a value beyond this
// may crash the game.
//
//
// For a detailed guide on Steam launch options, refer to:
// http://www.nextlevelgamer.com/counter-strike-source-launch-options/
//
//
//
// Removal Instructions:
// *******************************************************************
// Don't like the config? Simply delete autoexec.cfg and config.cfg
// from Steam\SteamApps\common\left 4 dead 2\left4dead2\cfg\
// Depending on your Steam Cloud settings, you may need to redefine
// your key bindings and personal preferences after this.
//
// Note: - Brightness too high? Set mat_monitorgamma_tv_enabled to 0
// - Prefer default crosshair? Set cl_crosshair_dynamic 1
//
//
// Additional Performance Links
// *******************************************************************
//
// Left 4 Dead 2 Performance Tweaking Guide
// http://www.nextlevelgamer.com/left-4-dead/left-4-dead-2-performance-tweaking-guide
//
// General Performance Tweaking Articles
// http://www.nextlevelgamer.com/tweaks
//
// Special Thanks Version 1.1
// *******************************************************************
// - To KeRupTion and mystrdat of the Steam forums for finding better
// values of the network variables found in version 1.1
// - To Fiszy, Kirisu, Jesse_lee, adsqew132 and anyone else I've missed
// for their support and general interest in this config
// - The entire Left 4 Dead 2 community
// *******************************************************************
// START OF KAIZEN'S LEFT 4 DEAD 2 PERFORMANCE CONFIG
// *******************************************************************
// Startup Settings
// ¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯
con_enable "1" // default 0; Enables Console
sv_cheats "1" // Enable Cheats (relax, this enables some CVARS to load, we disable it at the end)
cl_forcepreload "1" // default 0; Pre-load levels entirely into RAM (only use if you have 2GB of RAM or more)
// This reduces in-game stuttering, but may make you wait longer to join servers
// Personal Preference (modify as desired)
// ¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯
//sensitivity "10" // default 3; Set to personal preference (less than 10 is optimal)
cl_downloadfilter "nosounds" // Disables downloading of annoying SFX
cl_allowdownload "1" // Allows custom downloads from servers
cl_autohelp "0" // default 1; Turns off in-game help tips
// Crosshair Settings
// ¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯
crosshair "1" // Enable crosshair
cl_crosshair_alpha "255" // default 255; Sets crosshair transparency (0-255; 255 = No Transparency)
cl_crosshair_red "255" // default 138; Sets crosshair color (RGB) - Red value (0-255)
cl_crosshair_green "0" // default 182; Sets crosshair color (RGB) - Green value (0-255)
cl_crosshair_blue "0" // default 220; Sets crosshair color (RGB) - Blue value (0-255)
cl_crosshair_thickness "1.5" // default 2; Sets crosshair thickness
cl_observercrosshair "1" // Enables crosshair in spectator mode
cl_crosshair_dynamic "0" // default 1; Disables dynamic crosshair
// Lighting & Material Settings
// ¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯
r_dynamic "0" // default 1; Disables dynamic shadows (may have no effect in l4d2)
r_PhysPropStaticLighting "0" // default 1;
r_ambientfraction "0.2" // default 0.2;
r_radiosity "4" //
mat_bloom_scalefactor_scalar ".5" // default 1;
mat_monitorgamma_tv_enabled "1.6" // default 0; Increases brightness dramatically
// Sound Options
// ¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯
dsp_enhance_stereo "1" // default 0;
// Props
// ¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯
func_break_max_pieces "0" // default 15; Removes debris
cl_phys_timescale "1.0" //
// Netcode Tweaks
// ¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯
cl_updaterate "30" // default 20;
cl_cmdrate "30" // default 30;
rate "30000" // default 10000;
cl_resend "1.5" // default 6; How many seconds to wait before retrying to connect to a server
cl_interp "0.067" // default 0.1; Improves hit registration
cl_lagcompensation "1" // default 1; Improves hit registration
//net_graph "1" // default 0;
//net_graphpos "3" // default 1;
//net_graphheight "60" // default 60; 740 is good value for 1024x768
//net_graphproportionalfont "0" // default 1;
//budget_show_history "0" // default 1; Disables history graph
// Player Model Tweaks
// ¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯
r_eyemove "0" // default 1; Disables realistic eyeball movement
r_eyesize "0" //
r_eyeshift_z "0" //
r_eyeshift_y "0" //
r_eyeshift_x "0" //
// Disable cheats (to disable you from taking advantage!)
// ¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯
//
sv_cheats "0"
// Done loading
// ¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯
clear
echo "___________________________________________________________________"
echo "Kaizen's Left 4 Dead 2 Performance Config (v1.1)"
echo "http://www.nextlevelgamer.com"
echo "___________________________________________________________________"
echo "Kaizen's L4D2 performance config is designed to boost your frame"
echo "rates (FPS) while maintaining the best possible graphics experience."
echo "It also attempts to improve hit registration (i.e. the accuracy of "
echo "your shots) by optimizing network settings, improve the visibility"
echo "of the crosshair, and increase brightness so you can see enemies"
echo "better."
echo ""
echo "Unfortunately, as was the case with the original L4D, L4D2"
echo "restricts most of the Source Engine's console commands. Many of the"
echo "best performance options can only be accessed via the in game menu's."
echo "Feel free to tweak any of the settings to your liking, descriptions"
echo "of what commands do are provided."
echo ""
echo "If you have any suggestions, questions or other feedback please"
echo "visit www.nextlevelgamer.com and post on the forums."
echo ""
echo "Enjoy!"
echo " - Kaizen (kaizen@nextlevelgamer.com)"
echo ""
echo "P.S. Read the Left 4 Dead 2 performance guide @ www.nextlevelgamer.com"
echo "___________________________________________________________________"
echo ""
//
// *******************************************************************
// END OF KAIZEN'S LEFT 4 DEAD 2 PERFORMANCE CONFIG
// *******************************************************************
//
L4D2 FPS config.zip
