[KPhotoAlbum] Search performance

[Robert Krawitz]

After looking at the code and profiles, it's going to be hard to do a
lot better unless we change the internal representation of category
items.  We're spending quite a bit of time doing string comparisons;
we'd have to adopt some kind of internal indexing to do much better.

Whether that's worthwhile is another matter, but it might improve
startup as well.
-- 
Robert Krawitz                                     <rlk at alum.mit.edu>

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