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https://issues.apache.org/jira/browse/WICKET-6795?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17119732#comment-17119732
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Thomas Heigl commented on WICKET-6795:
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PR: https://github.com/apache/wicket/pull/437
> Avoid needlessly splitting and joining strings in AjaxEventBehavior
> -------------------------------------------------------------------
>
> Key: WICKET-6795
> URL: https://issues.apache.org/jira/browse/WICKET-6795
> Project: Wicket
> Issue Type: Improvement
> Components: wicket-core
> Affects Versions: 9.0.0-M5
> Reporter: Thomas Heigl
> Priority: Minor
> Attachments: image-2020-05-29-17-44-38-188.png
>
>
> {{AjaxEventBehavior.getEvent()}} splits JS event names on whitespace because
> the behavior can be bound to multiple events (i.e. "change click").
> Since most behaviors are bound to a single event, this costly operation can
> be avoided by checking for whitespace before splitting and re-joining the
> strings.
> More than 1s of my 30s test of rendering components with ajax behaviors was
> spent in this method:
> !image-2020-05-29-17-44-38-188.png!
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