ddrun 800x600 1000 fps is a fairly simple technique in the game. The point is that when you fall or climb stairs, you do not lose your running speed, i.e. you can keep 240-253 or more units. It is necessary to bind the button (bind «mwheelup» «+duck» - wheel up or bind «mwheeldown» «+duck» - wheel down) before execution. Syschematically, they fell =>duck=>strafe=>duck=>strafe and to infinity.
Download the program (Download) and go to the macro editor
press the button «Open file»
and select the downloaded file
assign a macro to a key and run the program