Network Smoothing Factor: This slider controls interpolation, a technique which determines where a particular moving object or character is currently located in the game world, based on actual locational data periodically received over the network. If an enemy soldier is running along in front of you, interpolation allows their movement to appear fluid, calculating their movement across the screen even though your computer is receiving only periodic updates of where they actually are. So instead of seeing a person jerkily warping from point to point, you see smooth animated motion all the way along. By reducing this slider, you can reduce the use of interpolation, and in turn potentially increase your accuracy by reducing latency; you're more likely to shoot at where someone actually is at any time. The downside to reducing the slider is that it may make character movements more jerky in the game. This depends on a range of factors, including the quality and latency of your own connection to the server, and those of the other players. Start by lowering the slider to the midway point. If after a period of gameplay on your favorite servers you don't notice any jerkiness in friendly or enemy movements, then lower it slightly again. If you do, raise it slightly until things are smooth.
