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diff --git a/vespajlib/developernotes/XMLWriterMicroBenchmark.java b/vespajlib/developernotes/XMLWriterMicroBenchmark.java
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+// Copyright 2016 Yahoo Inc. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
+package com.yahoo.text;
+
+import com.yahoo.io.ByteWriter;
+
+import java.io.ByteArrayOutputStream;
+import java.io.UnsupportedEncodingException;
+import java.nio.charset.Charset;
+import java.nio.charset.CharsetEncoder;
+
+/**
+ * It is what it says
+ *
+ * @author <a href="mailto:bratseth@yahoo-inc.com">Jon Bratseth</a>
+ */
+public class XMLWriterMicroBenchmark {
+
+    private final ByteArrayOutputStream output;
+    private final XMLWriter xmlWriter;
+
+    public XMLWriterMicroBenchmark(boolean optimize) {
+        // setup
+        output=new ByteArrayOutputStream();
+        Charset cs = Charset.forName("utf-8");
+        CharsetEncoder encoder = cs.newEncoder();
+        xmlWriter=new XMLWriter(new ByteWriter(output, encoder), optimize);
+    }
+
+    public void benchmark(int sizeInK,boolean verifyOutput) {
+        System.out.println("Warming up...");
+        writeStrings(1000); // warm-up
+
+        System.out.println("Starting benchmark...");
+        long startTime=System.currentTimeMillis();
+        writeStrings(sizeInK);
+        long endTime=System.currentTimeMillis();
+        System.out.println("Done.\nWriting " + sizeInK + "k strings took " + (endTime-startTime) + "ms");
+
+        if (verifyOutput) {
+            System.out.println("First 1k of output:");
+            String result=null;
+            try { result=output.toString("utf-8"); } catch (UnsupportedEncodingException e) { throw new RuntimeException(e); }
+            System.out.println(result.substring(0,Math.min(500,result.length())));
+        }
+    }
+
+    private void writeStrings(int sizeInK) {
+        for (int i=0; i<1000*sizeInK; i++) {
+            xmlWriter.openTag("dummytag").content(i,false).closeTag();
+        }
+    }
+
+    public static void main(String[] args) {
+        System.out.println("Unoptimized: -------------------------");
+        new XMLWriterMicroBenchmark(false).benchmark(10000,false);
+        System.out.println("Optimized:   ------------------------");
+        new XMLWriterMicroBenchmark(true).benchmark(10000,false);
+    }
+
+
+}