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https://issues.apache.org/jira/browse/FLEX-33865?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13812343#comment-13812343
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Benoit Wiart commented on FLEX-33865:
-------------------------------------
Micro Benchmark (On desktop)
nr = 10000
for (var i:Number = 0; i < nr; i++) {
result = LayoutElementHelper.parseConstraintExp(HERE THE VALUE);
}
NOTE that it's the worst case as this benchmark does not re-use the array
It won't be the case in ConstraintLayout#parseElementConstraints
LayoutElementHelper.parseConstraintExp("col1:10");
Before (avg) : 64ms
After (avg) : 9ms
LayoutElementHelper.parseConstraintExp("100");
Before (avg) : 37ms
After (avg) : 5ms
LayoutElementHelper.parseConstraintExp(100);
Before (avg) : 4ms
After (avg) : 6ms
LayoutElementHelper.parseConstraintExp(null);
Before (avg) : 4ms
After (avg) : 6ms
if needed we can change the LayoutElementHelper#parseConstraintExp and force
the caller to provide an array (and remove the added ifs)
> 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-optimizations.patch,
> layout-1-desktop-memory.png, layout-2-desktop-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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