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https://issues.apache.org/jira/browse/WICKET-6773?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17192786#comment-17192786
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Thomas Heigl commented on WICKET-6773:
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[~bitstorm]: I just created WICKET-6826.
> Improve performance of getting behaviors for components
> -------------------------------------------------------
>
> Key: WICKET-6773
> URL: https://issues.apache.org/jira/browse/WICKET-6773
> Project: Wicket
> Issue Type: Improvement
> Components: wicket-core
> Affects Versions: 8.7.0, 9.0.0-M5
> Reporter: Thomas Heigl
> Assignee: Sven Meier
> Priority: Major
> Fix For: 9.0.0, 8.9.0
>
>
> Another method that showed up as hot in our production profiler is
> {{Behaviors.getBehaviors()}}.
> I wrote a JHM benchmark and identified the problematic part of the method as
> {{Collections.unmodifiableList(subset)}}. For components without behaviors
> *but with* model or metadata, this method wraps an empty list in an
> unmodifiable list. This seems to be extremely slow because it does not
> optimize for the case of an empty list.
> If we return {{Collections.emptyList()}} in this case, the throughput of the
> method nearly doubles:
> ||Benchmark||Score||Units||
> |BehaviorsBenchmarks.getOld|86802535,017|ops/s|
> |BehaviorsBenchmarks.getNew|143565516,640|ops/s|
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