Lagometer

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Quake III lagometer during normal play.
Quake III lagometer during normal play.
Quake III lagometer showing lag spike.
Quake III lagometer showing lag spike.

A lagometer is a display of network latency on an internet connection and of rendering by the client. Lagometers are commonly found in computer games or IRC where timing plays a large role. Quake and derived games commonly have them. The delay between a request and its arrival is proportional to the height of the column.