Performance

OK it seems that performance is now becoming an important
issue for people. I myself would like to improve the
performance of our stylesheets for our sites as even with
only the first viewer generating the page it can still take
6 seconds to generate a page.

What is the best way to improve performance?

We are using inheriting style sheets so there are a lot
of calls to names templates that are overridden in sub stylesheets
that xsl:import the parent sheet.

Here are a few code snippets that might or might not be bad
programming style but they're here for examples to open
a discussion on tricks and performance...



Making an indent or just creating an empty table element:
<xsl:param name="mainindenthtml">
  <img src="/wdp/images/spc.gif" height="1">
    <xsl:attribute name="width"><xsl:value-of
select='$bfora:mainindent'/></xsl:attribute>
  </img>
</xsl:param>

      <xsl:choose>
        <xsl:when test="number($bfora:mainindent)">
          <TD width="{$bfora:mainindent}"><xsl:copy-of
select="$mainindenthtml"/></TD>
        </xsl:when>
        <xsl:otherwise>
          <TD />
        </xsl:otherwise>
      </xsl:choose>

Calling sub templates to do things:
<xsl:param name="tdgap"><td width="5"><img src="/wdp/images/spc.gif"
width="5"/></td></xsl:param>
	<xsl:if test="number($itemshowkey1) or
number($itemshownetworkicon1)">
		<TD>
			<xsl:attribute name="NOWRAP">1</xsl:attribute>
			<xsl:if test="number($itemshownetworkicon1)">
				<xsl:call-template name="shownetworkicon"/>
			</xsl:if>
			<xsl:if test="number($itemshowkey1)">
				<xsl:call-template name="showkey"/>
			</xsl:if>
		</TD>
		<xsl:copy-of select="$tdgap"/>
	</xsl:if>

Trying hard to keep my tables matching:
	<TD width="100%"
colspan="{1+not(number($itemshowdate2))+not(number($itemshowkey1))*2+not(num
ber($itemshowdate1) or
number($itemshownetworkicon1))*2+not(number($itemshownetworkicon3) or
number($itemshowweblink) or number($itemshowkey3))*2}">
		<xsl:if test="number($itemshowtitle)">
				<xsl:call-template name="showtitle"/>
		</xsl:if>
	</TD>

Loading up the keys:

      <xsl:call-template name="bfora:subtext"/>
  
      <xsl:variable name="keys" select="document($keyfile)"/>
      <xsl:variable name="current" select="."/>
      <xsl:for-each
select="$keys/keyfile/keygroup[contains(concat(',',$keygroup,','),concat(','
,id,','))]">
        <xsl:copy-of
          select="keyitem[word=$current/publickeyword or
                          word=$current/adminkeyword or
                          word=$current/group or
                          word=$current/network]/itemhtml/*"/>
      </xsl:for-each>
      
      <xsl:call-template name="bfora:subtext-end"/>

My text templates:
  <xsl:template name="bfora:subtext">
     <xsl:text disable-output-escaping="yes">
      &lt;font face="verdana, arial" size="1" color="#000000"&gt;
    </xsl:text>
  </xsl:template>

  <xsl:template name="bfora:subtext-end">
    <xsl:text disable-output-escaping="yes">
      &lt;/font&gt;
    </xsl:text>
  </xsl:template>
-- 
Richard Mitchell
Software Developer
http://www.vbnonline.com/
 

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