My measurements (similar numbers posted independently on CN by another Seestar user) show that there is 0.4sec of overhead per frame (2sec per 5 frames) for background analysis/stacking/writing to the internal drive plus 10sec of overhead for dithering. In other words 12sec of overhead for every 5 frames. If one turns off live stacking there will still be the 10sec of dithering overhead plus some portion of the 0.4sec for writing to the internal drive. Hence, most of the overhead is still there even with live stacking turned off, especially if you are working with 30sec or 60sec sub-frame exposures. With 10sec sub-frames the overhead from dithering dominates so, as the ZWO Tech says, it would be hard to notice the difference between live stacking on or off. There is a difference but it would be very small, especially with only 100 frames.
