Typically, mixer latency refers to the time it takes for a signal to travel from an analog input channel to the analog summing output. This process is also called "RTL", which is short for "Round Trip Latency". The actual RTL of an audio interface depends on many factors: The type of interface (USB, Thunderbolt, AVB or DANTE), the performance of the recording computer, the operating system used, the settings of the sound card/audio interface and those of the recording project (sample rate, number of audio & midi tracks, plugin load) and the signal delays of the converters used. Therefore it is not easy to compare the real performance of different audio interfaces in terms of latency.