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https://issues.apache.org/jira/browse/WICKET-6051?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15057387#comment-15057387
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Rakesh A commented on WICKET-6051:
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Making this class singleton might be better, but doing it now will result an
API break.
> Improve performance of CssUrlReplacer
> -------------------------------------
>
> Key: WICKET-6051
> URL: https://issues.apache.org/jira/browse/WICKET-6051
> Project: Wicket
> Issue Type: Improvement
> Components: wicket
> Affects Versions: 6.20.0
> Reporter: Rakesh A
> Attachments: CssUrlReplacer.java
>
>
> Implementation of org.apache.wicket.resource.CssUrlReplacer (if enabled),
> might affect performance, and increase the loading time of CSS files, if they
> contain many background-image properties with 'url()' values.
> In one instance, it took 18sec to process a CSS file with 663 instances of
> 'url()'.
> It might help, if we add option to specify 'exclusions' with certain CSS
> resources.
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