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Originally Posted by Adoby
If you have custom columns that depends on other columns, then I believe all values have to be initiated when you start Calibre. I have my metadata.db on a SSD drive and still noticed this very clearly. When I deleted those columns startup was fast again.
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Not quite. The columns are evaluated only when displayed. Sorting on a column is equivalent to displaying all values for that column.
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I don't believe Calibre even access the actual books when starting. Only metadata.db.
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Several versions ago calibre did look at attributes of books (modtime, etc) when starting. This was changed. I don't remember the version, but it was a couple of months ago at least. The current version does not look at book attributes unless you have a custom column that contains them (a "formats" column).