In Counter-Strike 1.6 , a "fast switch" configuration typically refers to enabling , which allows you to switch weapons instantly by pressing a number key without needing a secondary click to confirm.
// AWP Fast Switch Script alias +fastswitch "lastinv; wait; lastinv" alias -fastswitch "slot1" bind "q" "+fastswitch" cs 16 awp fast switch cfg better
rate "25000" cl_updaterate "101" cl_cmdrate "101" ex_interp "0.01" // Crucial for hitting accurate shots In Counter-Strike 1
It stops the weapon from automatically re-scoping if you hold down the fire button a fraction of a second too long. The Core Commands In Counter-Strike 1.6