Yeah, this is the huge drawback. Also AFAIK there are better screens already out there with >1000 colours, e.g. Boox Nova C https://medium.com/boox-content-hub/e-ink-kaleido-vs-new-kal...

I heard about that new tech but didn't know about them hitting the market. Are those also sold separately as just displays? Hopefully without the cost of an arm and leg

The issue is that the eink company has a monopoly in the market mainly due to them owning lots of patents. Also they seem to be only caring of the wholesale market, thus their new tech for the DIY/hacker crowd arrives always with a significant delay.

There is a single competitor DES color, but they seem to be in presale since years. https://www.youtube.com/watch?v=ckFJar6NC0o

The article says 15secs. I don't know what is right, just sayin'.

It could be right, 30 secs was my own timings. 2 updates were taking about a minute. Although on a different brand 5.7" 7 color eink display (Waveshare) but they look the same except how they are connected

I think it might be because I think two screens are using different algorithms to change images. Mine can only do a full clear, the author mentions that you need to do full clears from time to time to avoid ghosting or permanent burning. So maybe 15 secs is only for non-full clear image change

Tbf not much difference between 15 or 30 secs when it comes to usability