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https://issues.apache.org/jira/browse/SOLR-2944?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13165820#comment-13165820
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Yonik Seeley commented on SOLR-2944:
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I've done some ad-hoc testing using the useFilterForSortedQuery option on 1.4.1
and 3.5.
3.5 has turned out faster in every case I tested (between 1.3 and 2.1 times
faster).
The indexes built weren't quite equivalent because of the merge policies.
The 1.4 index had 6 segments, and the 3.5 index had 17 segments.
> Anecdotal evidence that useFilterForSortedQuery has gotten much slower in 3.5
> compared to 1.4
> ---------------------------------------------------------------------------------------------
>
> Key: SOLR-2944
> URL: https://issues.apache.org/jira/browse/SOLR-2944
> Project: Solr
> Issue Type: Bug
> Reporter: Hoss Man
>
> Pawel Rog reported on the user list that he was seeing significantly slower
> search performance and much higher CPU usage using Solr 3.5 compared to Solr
> 1.4 when using the same configs he had always used in Solr 1.4 -- even though
> he had a new index built with 3.5
> https://mail-archives.apache.org/mod_mbox/lucene-solr-user/201111.mbox/%3ccaf9zkbpho0y-pvskm4dkanc7aargacfsshnqbl+noot1ahx...@mail.gmail.com%3E
> Based on stacktraces from threaddumps the "useFilterForSortedQuery" was
> determined to be a contributing factor, and disabling it improved performance
> (exact comparison not provided).
> Would be nice to get some more details and a reproducible comparison
> (SOLR-2646 where are you???) and evluate why useFilterForSortedQuery would be
> slower in 3.5 then in 1.4 with the same data.
> Should consider actively removing the useFilterForSortedQuery=true option if
> there are no longer any usecases where it's better then
> useFilterForSortedQuery=false
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