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https://issues.apache.org/jira/browse/LUCENE-4598?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13526715#comment-13526715
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Michael McCandless commented on LUCENE-4598:
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bq. Since it's a low hanging fruit,

Wait, before you said:

bq. The per-segment iteration is more complicated (code-wise) ...

which sort of spooked me out :)

If it really is easy to prototype we should test and see if perf gains are 
worth it or not ...
                
> Facet aggregation should work per segment
> -----------------------------------------
>
>                 Key: LUCENE-4598
>                 URL: https://issues.apache.org/jira/browse/LUCENE-4598
>             Project: Lucene - Core
>          Issue Type: Improvement
>          Components: modules/facet
>            Reporter: Michael McCandless
>
> Currently the facet module uses MultiFields.* to pull the D&PEnum in 
> PayloadIterator, to access the payloads that store the facet ords.
> It then makes heavy use of .advance and .getPayload to visit all docIDs in 
> the result set.
> I think we should get some speedup if we go segment by segment instead ...

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