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https://issues.apache.org/jira/browse/LUCENE-1690?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12736525#action_12736525
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Richard Marr commented on LUCENE-1690:
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There's also another problem I've just noticed. Please ignore the latest patch.
> Morelikethis queries are very slow compared to other search types
> -----------------------------------------------------------------
>
> Key: LUCENE-1690
> URL: https://issues.apache.org/jira/browse/LUCENE-1690
> Project: Lucene - Java
> Issue Type: Improvement
> Components: contrib/*
> Affects Versions: 2.4.1
> Reporter: Richard Marr
> Priority: Minor
> Attachments: LruCache.patch, LUCENE-1690.patch
>
> Original Estimate: 2h
> Remaining Estimate: 2h
>
> The MoreLikeThis object performs term frequency lookups for every query.
> From my testing that's what seems to take up the majority of time for
> MoreLikeThis searches.
> For some (I'd venture many) applications it's not necessary for term
> statistics to be looked up every time. A fairly naive opt-in caching
> mechanism tied to the life of the MoreLikeThis object would allow
> applications to cache term statistics for the duration that suits them.
> I've got this working in my test code. I'll put together a patch file when I
> get a minute. From my testing this can improve performance by a factor of
> around 10.
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