Android: Why does it still take 1 second to store one smartpreview locally?

No it's not my internet, the 100Mbit line is fine even via WiFi.

Got a new phone, running LR Mobile Android since many hours to store about 30k smartpreviews locally to the phone memory, files that are supposed to be a few kb.

What does it take 1-2 seconds to advance one of those downloads?

Why cant LR Mobile do it in the background? I created a black low resolution 8h video that I can play to keep the screen active during the process (as the maximum timeout is 10 minutes).

Why is it so annyoing to setup Lightroom on a fresh device?

Why can't I selecet multiple albums and activate "store locally" instead of hitting each one by one?

Even if that is about 30GB in total, this should not take more than 20h to download.