In Q replication and event publishing, an approximate measurement of the difference between the time that the Q Capture programme commits data to WebSphere MQSeries and the time that WebSphere MQSeries makes the data available to the Q Apply programme or a receiving application. This is a subset of the end-to-end latency in a replication scenario or an event publishing scenario. See also Q Apply latency, Q Capture latency, end-to-end latency.