Ticdup (tic duplication) is a feature of the Doom networking engine which allows the bandwidth used by the game to be reduced. In a normal Doom game, the game clock (see tic) runs at 35 frames per second. In a network game, this means that the players' inputs are sampled 35 times per second. These are placed in structures (called ticcmds), and transmitted to the other computers in the game. The drawback to this system is the reduced movement accuracy. The reduced sampling rate means that the player has less precise control over their movement. The graphical framerate is also reduced.