Here's something I found on it:
https://www.mobileread.com/forums/sh...&postcount=245
Quote:
Originally Posted by JimmXinu
FYI, there's a Calibre tweak setting for maximum resort levels. I doubt this will be noticeable to most people, but it is there.
ID: maximum_resort_levels
Set the maximum number of sort 'levels' that calibre will use to resort the
library after certain operations such as searches or device insertion. Each
sort level adds a performance penalty. If the database is large (thousands of
books) the penalty might be noticeable. If you are not concerned about multi-
level sorts, and if you are seeing a slowdown, reduce the value of this tweak.
Code:
# Set the maximum number of sort 'levels'
maximum_resort_levels = 5
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I also can't find the post now but I seem to remember reading elsewhere on here that it's something to do with sorting multiple columns, e.g. if you sort by title, then series, then author, it'll 'forget' the title sort if it's set to 2. But unfortunately my memory isn't too good so I might be wrong on this.