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https://issues.apache.org/jira/browse/WICKET-1671?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12604434#action_12604434
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Ari Suutari commented on WICKET-1671:
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Would it be possible for Component.add to propaganate FLAG_AUTO to children if
the parent already has it ?
This way Component.isAuto wouldn't have to check the component tree upwards
every time, which would fix this.
Now, isAuto traverses the component tree up every time it is called (and it is
called in detach a lot,
since it traverses component tree from up to down) and for most of time
components don't have FLAG_AUTO
so this just wastes a lot of time.
This issue is very visible on pages which have a lot of images, for example,
since one page
render results in browser requesting those images - a lot of requests, a lot of
detach calls and
a lot of isAuto calls - page renders very slowly.
> Performance problem with detach (Component.isAuto)
> --------------------------------------------------
>
> Key: WICKET-1671
> URL: https://issues.apache.org/jira/browse/WICKET-1671
> Project: Wicket
> Issue Type: Improvement
> Components: wicket
> Affects Versions: 1.3.3
> Environment: Tomcat 5.5.23
> Windows XP/JDK 1.6.0_03
> Windows 2003/JDK 1.5
> Reporter: Heikki Uotinen
> Assignee: Johan Compagner
> Attachments: detach.zip
>
>
> We have an application that uses AjaxSelfUpdatingTimerBehavior to update a
> panel that has several child components.
> Application has a performance problem and profiler shows that the most time
> is consumed in Component.isAuto method.
> It seems that isAuto flag is checked up and down the component tree.
> There is attached a simple demonstration about the problem and screenshots of
> the profiler displays.
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