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https://issues.apache.org/jira/browse/FLEX-33865?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13812571#comment-13812571
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Justin Mclean commented on FLEX-33865:
--------------------------------------
Using this simple program:
<?xml version="1.0" encoding="utf-8"?>
<s:Application xmlns:fx="http://ns.adobe.com/mxml/2009";
xmlns:s="library://ns.adobe.com/flex/spark"
xmlns:mx="library://ns.adobe.com/flex/mx">
<s:Form width="100%" height="100%">
<s:FormItem label="First Name">
<s:TextInput width="120" />
</s:FormItem>
<s:FormItem label="Last Name">
<s:TextInput width="120"/>
</s:FormItem>
<s:FormItem label="Gender">
<s:layout>
<s:HorizontalLayout />
</s:layout>
<s:RadioButton label="M" />
<s:RadioButton label="F" />
</s:FormItem>
<s:FormItem label="Info">
<s:TextArea width="100%" height="100%" />
</s:FormItem>
</s:Form>
</s:Application>
Run and tested on Desktop with scout both with and without patch. Waited five
seconds then resized the browser window continually for 10 seconds. Not really
a real world example but the simplest way I could think of of testing.
(DOCreateTextLine takes same time so comparison should be fair.)
Patch overall time (mostly because string methods _replace and _split are not
called) by 30%. Total time in parseConstraintExp when from 240 ms to
undetectable.
Garbage collection 7% of total to 3% of total. Performance impact is likely to
be greater on mobile.
> ConstraintLayout / LayoutElementHelper are memory inefficient (and slow)
> ------------------------------------------------------------------------
>
> Key: FLEX-33865
> URL: https://issues.apache.org/jira/browse/FLEX-33865
> Project: Apache Flex
> Issue Type: Improvement
> Components: Mobile: Performance, Spark: Layout
> Affects Versions: Apache Flex 4.11.0
> Environment: mobile desktop
> Reporter: Benoit Wiart
> Assignee: Maurice Amsellem
> Labels: mobile, performance
> Attachments: 0001-ConstraintLayout-optimizationsV2.patch,
> layout-1-desktop-memory.png, layout-2-desktop-memory.png,
> layout-3-mobile-memory.png
>
>
> ConstraintLayout / LayoutElementHelper are doing too many memory allocation.
> it's really bad on mobile
> the attached screenshots were taken on desktop
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