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https://issues.apache.org/jira/browse/SLING-5117?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14947083#comment-14947083
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Joel Richard commented on SLING-5117:
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[~cziegeler], do you remember the details of SLING-1284? When exactly was this
an issue?
> Reuse PrintWriter to avoid initialisation overhead
> --------------------------------------------------
>
> Key: SLING-5117
> URL: https://issues.apache.org/jira/browse/SLING-5117
> Project: Sling
> Issue Type: Improvement
> Components: Scripting
> Reporter: Joel Richard
> Priority: Minor
> Labels: performance
>
> Surprisingly, java.io.PrintWriter is relatively expensive to initialise
> because of the AccessController.doPrivileged call in the constructor. Right
> now, it initialises for each include a new PrintWriter which costs 2-3%
> rendering time.
> In order to avoid this overhead, I would suggest to fix SLING-1284 properly
> (as far as I have seen there is a real fix in Tomcat) and create a reusable
> PrintWriter in PageContextImpl together with the JspWriter. In addition, the
> OnDemandWriterResponse must be adjusted to not create a new PrintWriter.
> Maybe, all the OnDemand* classes could also just be removed.
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