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Re: Slow XSLT

Subject: Re: Slow XSLT
From: David Carlisle <davidc@xxxxxxxxx>
Date: Thu, 13 Mar 2008 16:47:58 GMT
Re:  Slow XSLT
> it still takes 7 seconds to transform in IE and
> Firefox.

is that to do the transform or to render it?

If you are generating a large table then it can take a long time to
render. Do the transform using saxon or some other command line
processor to generate an html file and see how long it takes to render
that. (It's often possible to speed up table rendering by telling teh
css system that it has a fixed layout with fixed width columns, so that
it can do progressive rendering rather than wait until the end to
calculate widths,


> I was wondering if using KEYS it would help to improve
> the transformation?

probably nor, the only thing I noticed that might be inefficient is 

  <xsl:template match="Cell[not(*)]">
    <xsl:for-each select="/Report/Measures/Measure">
      <td>&#xa0;</td>
    </xsl:for-each>
  </xsl:template>
 

which does the same pass over the top of the document repeatedly, that
could be written as

  <xsl:template match="Cell[not(*)]">
    <xsl:copy-of select=""blankcell"/>
  </xsl:template>
 
  <xsl:variable name="blankcell">
    <xsl:for-each select="/Report/Measures/Measure">
      <td>&#xa0;</td>
    </xsl:for-each>
  </xsl:variable>

 David

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