I am not using a SD-Card at all.
I have 326 books on the device and 371 notes. Most of the notes are just highlighted text. And I think 371 notes it is definitively not much.
I can not think of a reason that the amount of notes slows a device down that much (as I said the notes function is unusable for me as the device stalls for 1-2 minutes each time after creating notes/highlights). It even happens if I highlight a text in a new book without other notes in it. It just does not make sense that notes of all other books would influence the speed.
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