XSLT productlist performance

I'm using the following XSLT to show a productlist. I'm calling the page using this URL: /list.aspx?products=1001;1002;1003; (where the numbers are the productnumbers).

The page is very slow to load - about 2-3 minuts. There's about 500 products in the shop.

What could be wrong?

<xsl:stylesheet xmlns:xsl="http://www.w3.org/1999/XSL/Transform" version="1.0">
  <xsl:output method="xml" omit-xml-declaration="yes" indent="yes" encoding="utf-8"/>
  <xsl:param name="html-content-type"/>

  <xsl:variable name="products">
    <xsl:value-of select="substring-after(/Template/GlobalTags/Global.Pageview.Url,'products=')" />
  </xsl:variable>
  
  <xsl:variable name="hostname">
    <xsl:value-of select="/Template/GlobalTags/Global.Request.Host" />
  </xsl:variable>
    
  <xsl:template match="/Template">    
      <xsl:choose>
      <xsl:when test="$products != ''">

        <xsl:for-each select="loop[@name='Products']/item[contains($products, Ecom.Product.Number)]">

            <xsl:value-of select="Ecom.Product.ID" />
            <xsl:value-of select="Ecom.Product.Name" />
            <xsl:value-of select="Ecom.Product.Price" />
            <xsl:value-of select="Ecom.Product.Number" />

              <form name="{Ecom.Product.ID}" id="{Ecom.Product.ID}" method="get">
                <xsl:value-of select="Ecom.Product.Form.Clean" disable-output-escaping="yes" />
                <xsl:if test="Ecom.Product.Stock &gt; 0"><a class="addtobasket" href="#">Add to bag</a></xsl:if>
              </form>

        </xsl:for-each>


      </xsl:when>
      <xsl:otherwise>

   Empty list.

      </xsl:otherwise>
    </xsl:choose>
    
  </xsl:template>
    
</xsl:stylesheet>

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XSLT productlist performance

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