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https://issues.apache.org/jira/browse/FLEX-12964?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Mark Kessler closed FLEX-12964.
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> There should be a suspend scrollbar validation in effects and transitions
> classes
> ---------------------------------------------------------------------------------
>
> Key: FLEX-12964
> URL: https://issues.apache.org/jira/browse/FLEX-12964
> Project: Apache Flex
> Issue Type: Task
> Components: Effects, Performance: Framework, Transitions
> Affects Versions: Adobe Flex SDK 3.0 (Release)
> Environment: Language Found: English
> Reporter: Adobe JIRA
> Assignee: Mark Kessler
>
> I suggest there is a suspend updating or creating a scrollbar until an effect
> or an animation (transition) is complete. The reason being that the animation
> is "stuttering" because it is creating, destroying or resizing the scrollbar.
> This may not be apparent all the time but I have a fairly new computer (1yr
> old) and it transitions and effects stutter on a lot of Flex applications.
> Steps to reproduce:
> 1. Goto this page and shrink the left divider box.
> http://www.teotigraphix.com/flexAssets/dockareafx/ResizeBarExample.html
> 2. Press the close button. The container closes and opens. Do this multiple
> times. You may have to use a less than new computer.
> 3. Watch when the panels are resized from or to a smaller state. A horizontal
> scrollbar is created and then destroyed (as it should).
>
> Actual Results:
> What happens is that when the scrollbar is made or destroyed, that process
> is causing the animation to "stutter" and skip frames. This stuttering breaks
> up the flow. It is not that apparent on this page because there are only
> three panels in the divided box. But when you have more components the
> stutter is much more apparent.
>
> Expected Results:
> Scrollbars are not created until animation is complete or animation remains
> smooth regardless of scrollbars existence.
>
> Workaround (if any):
> not sure, suspend background processing? If suspendBackgroundProcessing is
> designed to take care of this, I suggest it be turned ON by default.
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