Excerpts from William Morgan's message of Thu Oct 01 09:46:20 -0400 2009:
> Reformatted excerpts from Rich Lane's message of 2009-09-30:
> > They're about 3 times faster on my machine with this patch. An
> > optimization the Xapian devs have been planning to make (and that this
> > patch is necessary to take advantage of) should increase performance
> > much more.
> 
> Awesome. Out of curiousity, what's the optimization?

replace_document currently deletes all the old postings and inserts new
ones. It can be optimized to make the minimal set of modifications.
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