Hmmm... not sure the sound of slowing down the display of "no search" sounds a good idea. If you have multiple secondary sort columns, is the penalty multiplied? e.g. by title/series/author?
I did find it a bit "laggy" when I was sorting each "next result group" with two calls to sort_by_named_field. If that is indicative of the extra time that will be added to every time you clear your search results it probably isn't the best to change this way.
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