Tim, thank you for the ideas.
I had forgotten about marking and deleting.
This is what I have working.
Using :%s is more than twice as fast as :g
Also no need for the :sort iu at the end.
let start = reltime()
%s/\(^.\+\n\)\1\+/@\1/ " mark and remove all but one dup
v/^@/d " delete un-marked
%s/^@// " remove mark
endfun " :call KeepOneDup()<cr>
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