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https://issues.apache.org/jira/browse/LUCENE-1483?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12655025#action_12655025
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Michael McCandless commented on LUCENE-1483:
--------------------------------------------

bq. on first quick test, I still see the 20% slowdown with 100 more/less 
segments.

Argh!  Can you post your current patch?

> Change IndexSearcher to use MultiSearcher semantics for sorted searches
> -----------------------------------------------------------------------
>
>                 Key: LUCENE-1483
>                 URL: https://issues.apache.org/jira/browse/LUCENE-1483
>             Project: Lucene - Java
>          Issue Type: Improvement
>    Affects Versions: 2.9
>            Reporter: Mark Miller
>            Priority: Minor
>         Attachments: LUCENE-1483.patch
>
>
> Here is a quick test patch. FieldCache for sorting is done at the individual 
> IndexReader level and reloading the fieldcache on reopen can be much faster 
> as only changed segments need to be reloaded.

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