Default value
0 (uses world.tick_lag value)
This is a client version of world.tick_lag, so that the client can run at a faster speed for animations. For example, setting client.tick_lag to 0.25 while world.tick_lag is the default 1 will mean that all animations and glides are smoothed out and displayed at 40 FPS, even though the server still runs at 10 FPS. The result is a nicer-looking game with no additional impact on the server.
When this value is 0, the client and server tick at the same rate.