A newer addition to commercial airliners is seatback screens, that allow the passengers to watch movies, TV, and so forth. On most airlines, there is also a map, that shows you the aircraft's flight path, position, airspeed, and altitude.
I have noticed that the information displayed on the map screen only updates in roughly 15-second intervals. Is there any reason for this? I can't imagine that there would be any bandwidth limitation issue for such a small amount of text data (for example, I can drive a ton of data to my ForeFlight app with my relatively mid-range GA IFD), so I imagine there must be a safety or technical reason for it.