[tomsem]

I powered up my HD7 (2013) for the first time in months, it downloaded update 5.3.3.3.

It took a number of minutes to sync my content (my inference as to what it was doing), and nothing worked until it did (could not delete or install apps, edit collections, download books etc). After that it was ‘normal’ albeit slower than my HD8 (2017) which has more RAM. This seemed about the same as what happened the last time I updated my HD6 (2014): I just had to give it time.

Note I had next to nothing ‘on device’ when this was happening. So it is not busy indexing content, as happens on Kindle. I think it is just creating a local database of content (books, audiobooks, apps etc.), and checking all of the ‘system components’ (as opposed to OS update) to make sure those are up to date too.

I have maybe 2500 books+docs. With a larger library, I can imagine this ‘sync time’ goes up at least in linear and possibly geometric proportion. So 10000 might take a couple of hours, maybe even much more.

I would give it more time, maybe keep it plugged in and disable screen lock (in developer options), keep wifi connected, let it run overnight.

I can imagine there might be tool that can inspect processes running and give you some idea of what it is busy with.

But the leading theory of ‘slowness’ must be that it is busy with <u>something</u>, and once that something if finished it will return to normal.