That's fast! It seems even faster then using mpv, even though you can't use it like this from the command line.

mpv *.jpeg --shuffle --loop-playlist --image-display-duration=2.0 --fullscreen

I remember, 30 years ago there were similar ultrafast image viewers for DOS, they didn't even need windows. I was partial to QPV/386, but there were others. Linux console has fim. It was great to be able to zoom and pan with the keyboard.

https://www.nongnu.org/fbi-improved/ https://www.oreilly.com/library/view/png-the-definitive/9781...