Vacuum issue fixed:
https://github.com/kovidgoyal/calibr...09f5e15b9dc63d
@Karellen: calibre portable only remembers libraries inside the portable folder.
@cmfy.n: I need the metadata.db from your calibre library that is experiencing slowness to debug
@un_pogaz: Yes, adding sizes was on my TODO list, didnt have time to get around to it.