performance hit using getxmldocumentbyurl for rss feed

Shannon 148 posts 171 karma points

Nov 12, 2010 @ 17:38

I am using the folling code to download, cache, and display an RSS Feed on my website

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE xsl:stylesheet [ <!ENTITY nbsp "&#x00A0;"> ]>
<xsl:stylesheet
    version="1.0"
    xmlns:xsl="http://www.w3.org/1999/XSL/Transform"
    xmlns:msxml="urn:schemas-microsoft-com:xslt"
    xmlns:umbraco.library="urn:umbraco.library"
    xmlns:Exslt.ExsltCommon="urn:Exslt.ExsltCommon"
    xmlns:Exslt.ExsltDatesAndTimes="urn:Exslt.ExsltDatesAndTimes"
    xmlns:Exslt.ExsltMath="urn:Exslt.ExsltMath"
    xmlns:Exslt.ExsltRegularExpressions="urn:Exslt.ExsltRegularExpressions"
    xmlns:Exslt.ExsltStrings="urn:Exslt.ExsltStrings"
    xmlns:Exslt.ExsltSets="urn:Exslt.ExsltSets"
    exclude-result-prefixes="msxml
 umbraco.library Exslt.ExsltCommon Exslt.ExsltDatesAndTimes 
Exslt.ExsltMath Exslt.ExsltRegularExpressions Exslt.ExsltStrings 
Exslt.ExsltSets">

<xsl:output method="xml" omit-xml-declaration="yes"/>
<xsl:param name="currentPage"/>

<xsl:template match="/">
  <!-- start writing XSLT -->
  <xsl:variable name="MyFeed" select="umbraco.library:GetXmlDocumentByUrl('http://gizmodo.com/tag/top/index.xml')" />
  <ul>
    <xsl:for-each select="$MyFeed/rss/channel/item [position() &lt;= 3]">
      <li>
        <xsl:element name="a">
          <xsl:attribute name="rel">external</xsl:attribute>
          <xsl:attribute name="href">
          <xsl:value-of select="link" />
          </xsl:attribute>
          <xsl:value-of select="title" />
        </xsl:element>
      </li>
    </xsl:for-each>
  </ul>
</xsl:template>
</xsl:stylesheet>

I am getting a huge performace hit at "After performing transformation". Can someone look at my code and see if there are any performance improvements that can be made?

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Jan Skovgaard 11280 posts 23678 karma points MVP 11x admin c-trib

Nov 12, 2010 @ 19:45

How huge is your hit?

At a first sight it looks ok to me...maybe some of the brighter XSLT wizards have a more thorough opinion on this. But it's interesting to get to know, how man seconds it takes to perform the tranformation.

/Jan

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Shannon 148 posts 171 karma points

Nov 12, 2010 @ 19:48

Here is the debug:

umbracoMacro    Macro loaded from cache (ID: 34, RSS Feed Mac Life)    0.7637827    0.000156
renderMacro    Rendering started (macro: RSS Feed Mac Life, type: 1, cacheRate: 600)    0.7638197    0.000037
umbracoMacro    Before adding extensions    0.7638985    0.000079
umbracoXsltExtension    Extension added: urn:Exslt.ExsltCommon, ExsltCommon    0.765012    0.001114
umbracoXsltExtension    Extension added: urn:Exslt.ExsltDatesAndTimes, ExsltDatesAndTimes    0.7650481    0.000036
umbracoXsltExtension    Extension added: urn:Exslt.ExsltMath, ExsltMath    0.7650697    0.000022
umbracoXsltExtension    Extension added: urn:Exslt.ExsltRegularExpressions, ExsltRegularExpressions    0.7650889    0.000019
umbracoXsltExtension    Extension added: urn:Exslt.ExsltStrings, ExsltStrings    0.7651111    0.000022
umbracoXsltExtension    Extension added: urn:Exslt.ExsltSets, ExsltSets    0.7651312    0.000020
umbracoXsltExtension    Extension added: urn:tagsLib, library    0.7651502    0.000019
umbracoXsltExtension    Extension added: urn:BlogLibrary, BlogLibrary    0.7651691    0.000019
umbracoXsltExtension    Extension added: urn:UCommentLibrary, XSLTLibrary    0.7651882    0.000019
umbracoXsltExtension    Extension added: urn:uForum, Xslt    0.7652072    0.000019
umbracoXsltExtension    Extension added: urn:uForum.raw, RawXml    0.7652282    0.000021
umbracoMacro    After adding extensions    0.7652467    0.000019
umbracoMacro    Before performing transformation    0.765293    0.000046
umbracoMacro    After performing transformation    1.2785128    0.513220

Multiply this by 8 and my loadtime goes up to ~8 seconds

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Shannon 148 posts 171 karma points

Nov 15, 2010 @ 20:29

Anyone else have any feedback?

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Sebastiaan Janssen 5060 posts 15522 karma points MVP admin hq

Nov 15, 2010 @ 21:10

Not much feedback, but it looks like the Gizmodo feed that you've put in there is very slow at the moment, so that might account for the slowdown.

I have good experiences with the Feed Cache package that does this fetching of the feed asynchronously, which will prevent these slowdowns.

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Performance hit using GetXmlDocumentByUrl for RSS Feed