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https://issues.apache.org/jira/browse/LUCENE-10517?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17524262#comment-17524262
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Michael McCandless commented on LUCENE-10517:
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This is a very impressive performance jump for the "pure browse" faceting case!
I'll review the PR soon. Thanks [~ChrisHegarty]!
> Improve performance of SortedSetDV faceting by iterating on class types
> -----------------------------------------------------------------------
>
> Key: LUCENE-10517
> URL: https://issues.apache.org/jira/browse/LUCENE-10517
> Project: Lucene - Core
> Issue Type: Improvement
> Components: core/index
> Affects Versions: 9.1
> Reporter: Chris Hegarty
> Priority: Minor
> Time Spent: 40m
> Remaining Estimate: 0h
>
> While analysing various profiles, [@grcevski|https://github.com/grcevski] and
> I can came across this potential improvement.
> SortedSetDV faceting (and friends), can improve performance within tight
> loops by using invokevirtual (rather than invokeinterface). The C2 JIT
> compiler can produce slightly more optimal code in this case, and since these
> loops are very hot, the impact can be significant (in the order of 10-30%).
> This issue is in some ways similar to, and builds upon, prior optimisations
> in this area, like say LUCENE-5300 or more recently LUCENE-5309
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