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https://issues.apache.org/jira/browse/WICKET-5983?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Martijn Dashorst resolved WICKET-5983.
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Resolution: Fixed
> O(n^2) complexity in MarkupContainer.add
> ----------------------------------------
>
> Key: WICKET-5983
> URL: https://issues.apache.org/jira/browse/WICKET-5983
> Project: Wicket
> Issue Type: Bug
> Components: wicket
> Affects Versions: 1.5.13, 6.20.0, 7.0.0
> Reporter: Emond Papegaaij
> Assignee: Emond Papegaaij
> Priority: Minor
> Fix For: 7.1.0
>
>
> MarkupContainer.add has O(n^2) complexity on the number of childs, because it
> searches through all other childs for a child with the same id. This may not
> be much of a problem in most situations, but in large tables, the performance
> can get very bad.
> Constructing a table with n rows, with 6 cells in each row takes (10k
> iterations) in Wicket 6.20.0 (Wicket 7 should be comparable, but WICKET-5981
> kills perfomance badly):
> 10 -> 132ms
> 20 -> 245ms
> 40 -> 465ms
> 80 -> 1000ms
> 160 -> 2444ms
> 320 -> 6989ms
> 640 -> 23201ms
> 1280 -> 80784ms
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