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https://issues.apache.org/jira/browse/LUCENE-5638?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13988378#comment-13988378
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Uwe Schindler commented on LUCENE-5638:
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I also created another subtask to clean up the Token class and remove stupid
copy-ctors and all those reinit() methods. Unmaintainable! LUCENE-5640
> Default Attributes are expensive
> --------------------------------
>
> Key: LUCENE-5638
> URL: https://issues.apache.org/jira/browse/LUCENE-5638
> Project: Lucene - Core
> Issue Type: Bug
> Components: modules/analysis
> Reporter: Robert Muir
> Attachments: LUCENE-5638.patch
>
>
> Changes like LUCENE-5634 make it clear that the default AttributeFactory
> stuff has a very high cost: weakmaps/reflection/etc.
> Additionally I think clearAttributes() is more expensive than it should be:
> it has to traverse a linked-list, calling clear() per token.
> Operations like cloning (save/restoreState) have a high cost tll.
> Maybe we can have a better Default? In other words, rename
> DEFAULT_ATTRIBUTE_FACTORY to REFLECTION_ATTRIBUTE_FACTORY, and instead have a
> faster default factory that just has one AttributeImpl with the "core ones"
> that 95% of users are dealing with (TOKEN_ATTRIBUTE_FACTORY?): anything
> outside of that falls back to reflection.
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