The frequency at which the Dragonfly computes the positions (and makes them available via the API or writes a line inside the local CSV file) depends on the frequency at which the frames are processed (which is a function of the computing unit on which Dragonfly is running).  Anyway, in general, Dragonfly (running on a proper computing unit) shows on average 20-30 FPS inside the Dragonfly Web User Interface. This means that Dragonfly computes 20-30 positions/per second and so 20-30 positions/per seconds can be retrieved accessing the local CSV files or calling the real-time API.