Add the file server.cfg to the script, in the cstrike folder where you have installed the server.
Usage: After you have started the server, write in the console what setting you want, considering the type of internet connection you have, and also considering the type of computer that you keep the server on. For example, if you have a server on lan, write in the console vfast, or if you have a server where you have players in the same network you can use fast or norm. You can acces this script by "rcon" considering the variation of the lag on the server. you should not have any setting about the rate in server.cfg, listenserver.cfg, game.cfg, settings.cfg, amx.cfg etc.

Alias "dslow" "sv_minrate 2500;sv_maxrate 2500;sv_minupdaterate 5;sv_maxupdaterate 5;echo dead slow"
alias "vslow" "sv_minrate 3500;sv_maxrate 3500;sv_minupdaterate 13;sv_maxupdaterate 13;echo very slow"
alias "slow" "sv_minrate 3500;sv_maxrate 5000;sv_minupdaterate 14;sv_maxupdaterate 14;echo slow"
alias "norm" "sv_minrate 3500;sv_maxrate 7500;sv_minupdaterate 15;sv_maxupdaterate 15;echo normal"
alias "fast" "sv_minrate 3500;sv_maxrate 9999;sv_minupdaterate 20;sv_maxupdaterate 20;echo fast"
alias "vfast" "sv_minrate 3500;sv_maxrate 20000;sv_minupdaterate 20;sv_maxupdaterate 60;echo LAN fast"
alias "rates" "sv_minrate;sv_maxrate;sv_minupdaterate;sv_maxupdaterate"