It is highly recommended that you have an autoexec.cfg file since you need to lower your interpolation in order to join a team on a competitive game mode.
Download this file and put it in the
Steam\steamapps\common\Left 4 Dead 2\left4dead2\cfg folder. Restart your game.
bind f3 "record 1;stop;sm_toggleready" bind f4 "disconnect" bind f5 "sm_spectate" bind pgup "jointeam 2" bind pgdn "jointeam 3" bind t "sm_tank;sm_health" cl_interp 0 cl_interp_ratio 0 cl_cmdrate 100 cl_updaterate 100 rate 100000
You can modify it as you wish.
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