One technique that speeds up the frame animation process is copying and pasting keyframes. Let’s say you have a huge set of images (or several groups of elements) that you want to fade between. Fade one of the groups out, then copy and paste that animation to each of the other elements or images. This action can then be repeated and the animation adjusted to speed things up:
(While this is Hype 2, the same workflow applies).
FYI this set of images was exported as frames from a GIF in Photoshop.