Speeding up processing (with sablotron or saxon)

ok I have a piece of XSLT that processes a large XML file into smaller
chunks. The problem I have is that the deeper down into the XML file I am
processing the longer it takes. Is this just due to the way XSLT parsers
work or can I tweak my XSL file so it processes faster?

I get the same effect when I used to process the file as one pass using
Saxon Result:document as I do processing as seperate XSL files with either
Saxon or Sablotron.


This is the seperate file XSL file:- (Change the server[@name='Ahazi'] as
needed)
<?xml version="1.0"?>
<xsl:transform xmlns:xsl="http://www.w3.org/1999/XSL/Transform"
version="1.0">
<xsl:output method="xml" indent='yes' encoding="utf-8"/>

<xsl:template match="server" />
<xsl:template match="server[@name='Ahazi']">
<resources>
<xsl:for-each
select=".//resource[not(@swgcraft_id=preceding::*/@swgcraft_id)]">
<xsl:sort select="."/>
<resource>
<xsl:attribute name="swgcraft_id" >
<xsl:value-of select="./@swgcraft_id"/>
</xsl:attribute>
<xsl:copy-of select="name"/>
<xsl:copy-of select="type"/>
<xsl:copy-of select="er"/>
<xsl:copy-of select="cr"/>
<xsl:copy-of select="cd"/>
<xsl:copy-of select="dr"/>
<xsl:copy-of select="fl"/>
<xsl:copy-of select="hr"/>
<xsl:copy-of select="ma"/>
<xsl:copy-of select="oq"/>
<xsl:copy-of select="sr"/>
<xsl:copy-of select="ut"/>
<xsl:copy-of select="pe"/>
<xsl:copy-of select="verified"/>
<xsl:copy-of select="available_timestamp"/>
<planets_on>
<xsl:variable name="resource" select="./@swgcraft_id" />
<xsl:for-each select="../../..//resource[@swgcraft_id=$resource]">
<xsl:value-of select="../../@name"/>
<xsl:if test="position()!=last()">
</xsl:if>
</xsl:for-each>
</planets_on>
</resource>
</xsl:for-each>
</resources>
</xsl:template>

</xsl:transform>

the old saxon XSL file that had the same effect is:-

<?xml version="1.0"?>
<xsl:transform xmlns:xsl="http://www.w3.org/1999/XSL/Transform"
version="2.0">
<xsl:output method="xml" indent='yes' encoding="utf-8"/>

<xsl:template match="server">
<xsl:variable name="servername" select="substring(@name,1,4)"/>
<xsl:variable name="filename"
select="concat('file:///','d:/swg/crafterscorner/','currentresources_',$serv
ername,'.xml')"/>
<xsl:result-document href="{$filename}">
<resources>
<xsl:for-each
select=".//resource[not(@swgcraft_id=preceding::*/@swgcraft_id)]">
<xsl:sort select="."/>
<resource>
<xsl:attribute name="swgcraft_id" select="./@swgcraft_id"/>
<xsl:copy-of select="name"/>
<xsl:copy-of select="type"/>
<xsl:copy-of select="er"/>
<xsl:copy-of select="cr"/>
<xsl:copy-of select="cd"/>
<xsl:copy-of select="dr"/>
<xsl:copy-of select="fl"/>
<xsl:copy-of select="hr"/>
<xsl:copy-of select="ma"/>
<xsl:copy-of select="oq"/>
<xsl:copy-of select="sr"/>
<xsl:copy-of select="ut"/>
<xsl:copy-of select="pe"/>
<verified>
<xsl:if test="substring(verified,1,1)='t'">
<xsl:value-of select="'Y'"/>
</xsl:if>
<xsl:if test="substring(verified,1,1)='f'">
<xsl:value-of select="'N'"/>
</xsl:if>
</verified>
<xsl:copy-of select="available_timestamp"/>
<planets_on>
<xsl:variable name="resource" select="./@swgcraft_id" />
<xsl:for-each select="../../..//resource[@swgcraft_id=$resource]">
<xsl:value-of select="../../@name"/>
<xsl:if test="position()!=last()">
</xsl:if>
</xsl:for-each>
</planets_on>
</resource>
</xsl:for-each>
</resources>
</xsl:result-document>
</xsl:template>

</xsl:transform>

the source XML file can be found at
http://www.swgcraft.com/sendfile.php?file=currentresources.xml.gz

processing of the servers towards the start of the xml file (eg Ahazi and
Bloodfin) takes only a few seconds, but processing the ones near the end of
the xml file (eg Chimera and Infinity) takes a couple of minutes.
Is there any way of speeding up the processing of the servers near the end
of the xml file?