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I think the performance was significantly improved with the new database code some months(?) ago, so old posts about ways to improve performance may not be very relevant or even wrong. I haven't had any reason to investigate new ways improve performance, since calibre currently is fast enough for me, without any special tricks.
I have the libraries on a local fast HD and use no custom columns or column coloring rules and only have epubs and pdfs in my main libraries.
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