Rakesh A created WICKET-6051:
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             Summary: 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


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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