[jira] [Commented] (FLEX-34467) Spark DataGrid performance extremely decreased since "gridView" is introduced.

["Alex Harui (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/FLEX-34467?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14243724#comment-14243724 ] 

Alex Harui commented on FLEX-34467:
-----------------------------------

FLEX-34644 found that the DG was creating a display object that was sized relative to the number of items in the data provider.  Please re-test and see if the fix for FLEX-34644 also fixes this issue.


> Spark DataGrid performance extremely decreased since "gridView" is introduced.
> ------------------------------------------------------------------------------
>
>                 Key: FLEX-34467
>                 URL: https://issues.apache.org/jira/browse/FLEX-34467
>             Project: Apache Flex
>          Issue Type: Bug
>          Components: Spark: DataGrid
>    Affects Versions: Apache Flex 4.11.0, Apache Flex 4.12.0, Apache Flex 4.13.0, Apache Flex 4.12.1
>            Reporter: Vadim Usoltsev
>            Priority: Critical
>
> Since there is gridView appeared in DataGridSkin the performance of the component is extremely decreased. By performance I mean update display list operations. At the moment the overall performance depends on data provider size, but this is contrary to the principle of the DataGrid when you can display huge amount of data with limited amount of item renderers instances.
> How to reproduce:
> Create s:DataGrid with a few columns, generate dataProvider with objects corresponging to the columns. For ~500 objects you will already see visible rendering lugs, just move your mouse over the grid or try to scroll. For ~2000 objects DataGrid becomes totally unusable.
> This behaviour can be reproduced in 4.11-4.13 flex SDK versions, while in 4.5.1 and even in 4.9.1 everything is Okey.



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