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https://issues.apache.org/jira/browse/LUCENE-7115?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15202202#comment-15202202
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Gregory Chanan commented on LUCENE-7115:
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I uploaded a patch based on a previous version, going to upload a new one
shortly.
> Speed up FieldCache.CacheEntry toString by setting initial StringBuilder
> capacity
> ---------------------------------------------------------------------------------
>
> Key: LUCENE-7115
> URL: https://issues.apache.org/jira/browse/LUCENE-7115
> Project: Lucene - Core
> Issue Type: Improvement
> Components: core/search
> Reporter: Gregory Chanan
> Assignee: Gregory Chanan
>
> Solr can end up printing a lot of these objects via the JmxMonitoriedMap, see
> SOLR-8869 and SOLR-6747 as examples.
> From looking at some profiles, a lot of time and memory are spent resizing
> the StringBuilder, which doesn't set the initial capacity.
> On my cluster, the strings are a bit over 200 chars; I set the initial
> capacity to 250 and ran tests calling toString 1000 times. Tests
> consistently show 10-15% improvement when setting the initial capacity.
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