In my case, I have 4000+ books in my Calibre library and almost all of them are loaded on my Glo HD. It was taking me around 3-4 minutes each time to update the reading status for all of my books, with a laptop from 2013 (i7, 6GB of RAM, SSD, with Windows 10 installed on it). I thought it was acceptable given the size of the database but I ended up disabling it and updating the reading status manually because I often connect my reader more than once (i.e. for updating series information) and it was bothering me.
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