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  Optimize XSL
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You should avoid using the descendant axes (//, etc.).

Because of a memory leak in the 1.1 .NET framework (http://support.microsoft.com/default.html?scid=KB;EN-US;Q316775) which can lead to increased CPU usage, implement .NET extensions instead of script embedded in the XSL code with msxml:script. .NET 2.0 may correct this issue.  Implementing XSL Extensions is described at Creating Sitecore Extension Function.


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