You must have a very old, or very weird device. That sort of behaviour is more than a decade old.

There are refresh modes now which are very good at partial updates.

It's a pretty recent Kobo device.

	▲	vaughnegut 5 days ago \| parent \| next [-]
		Kobo devices do a full page refresh periodically, which is probably what you're seeing. iirc it will do it on chapter transitions to make it less jarring. Basically, it's intentional and relatively rare (unless you have really really short chapters).
	▲	bbarnett 6 days ago \| parent \| prev [-]
		I have one of these: https://www.amazon.com/dp/B0CDBYFH81 and a colour Boox. The refresh on the Boox is so fast, you can watch video. I don't think the Meebook has refresh issues, it's definitely very fast for back/forward. Of course I don't have page turn animations on. I use the kindle app on it, and KOreader. If you get this, know that there is a thread to drop in a script, so the volume buttons page turn correctly when upside down. If you live in Amazon turf, you can always buy and return if not suitable? There are some reviews on Amazon.