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copied!<p>I may have a solution to your problem, if you're willing to give up on XOM. My solution consists of using the <a href="http://docs.oracle.com/javase/7/docs/api/javax/xml/xpath/XPath.html" rel="nofollow">XPath API</a> and <a href="http://santuario.apache.org/" rel="nofollow">Apache Santuario</a>.</p> <p>The difference in performance is impressive, but I thought it would be good to provide a comparison.</p> <p>For the tests I've used the XML file you provided in your question with 1.5MB.</p> <h2>The XOM Test</h2> <pre><code>FileInputStream xmlFile = new FileInputStream("input.xml"); Builder builder = new Builder(false); Document doc = builder.build(xmlFile); FileOutputStream fos = new FileOutputStream("output.xml"); nu.xom.canonical.Canonicalizer outputter = new nu.xom.canonical.Canonicalizer(fos); Nodes nodes = doc.getRootElement().query("./descendant-or-self::node()|./@*"); outputter.write(nodes); fos.close(); </code></pre> <h2>The XPath/Santuario Test</h2> <pre><code>org.apache.xml.security.Init.init(); DocumentBuilderFactory domFactory = DocumentBuilderFactory.newInstance(); domFactory.setNamespaceAware(true); DocumentBuilder builder = domFactory.newDocumentBuilder(); org.w3c.dom.Document doc = builder.parse("input.xml"); XPathFactory xpathFactory = XPathFactory.newInstance(); XPath xpath = xpathFactory.newXPath(); org.w3c.dom.NodeList result = (org.w3c.dom.NodeList) xpath.evaluate("./descendant-or-self::node()|./@*", doc, XPathConstants.NODESET); Canonicalizer canon = Canonicalizer.getInstance(Canonicalizer.ALGO_ID_C14N_OMIT_COMMENTS); byte canonXmlBytes[] = canon.canonicalizeXPathNodeSet(result); IOUtils.write(canonXmlBytes, new FileOutputStream(new File("output.xml"))); </code></pre> <h2>The Results</h2> <p><img src="https://lh6.googleusercontent.com/-NeJJ2ETZ-JQ/UMClI5Qa58I/AAAAAAAABG4/QC9fH3a_hvw/s477/Selection_001.png" alt="graphic result"></p> <p>Below is a table with the results in seconds. Tests were performed 16 times.</p> <pre><code>╔═════════════════╦═════════╦═══════════╗ ║ Test ║ Average ║ Std. Dev. ║ ╠═════════════════╬═════════╬═══════════╣ ║ XOM ║ 140.433 ║ 4.851 ║ ╠═════════════════╬═════════╬═══════════╣ ║ XPath/Santuario ║ 2.4585 ║ 0.11187 ║ ╚═════════════════╩═════════╩═══════════╝ </code></pre> <p>The difference in performance is huge and it is related with the implementation of the <a href="http://www.w3.org/TR/xpath/" rel="nofollow">XML Path Language</a>. The downside of using XPath/Santuario is that they're not as simple as XOM.</p> <h2>Test Details</h2> <p>Machine: Intel Core i5 4GB RAM<br> SO: Debian 6.0 64bit<br> Java: OpenJDK 1.6.0_18 64bit<br> XOM: 1.2.8<br> Apache Santuario: 1.5.3<br></p>

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