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diff --git a/vespajlib/developernotes/Utf8MicroBencmark.java b/vespajlib/developernotes/Utf8MicroBencmark.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;
+
+/**
+ * @author <a href="mailto:balder@yahoo-inc.com">Henning Baldersheim</a>
+ * @since 5.2
+ */
+
+public class Utf8MicroBencmark {
+    public void benchmark(int sizeInK) {
+        String [] l = new String[1000];
+        for (int i=0; i < l.length; i++) {
+            l[i] = "typical ascii string" + i;
+        }
+        System.out.println("Warming up...");
+        utf8encode(l, 10000); // warm-up
+        utf8encodeFast(l, 10000);
+
+        long startTime, endTime, sum;
+        System.out.println("Starting benchmark ...");
+        startTime=System.currentTimeMillis();
+        sum = utf8encode(l, sizeInK);
+        endTime=System.currentTimeMillis();
+        System.out.println("Utf8 encoding " + sizeInK + "k strings took " + (endTime-startTime) + "ms generating " + sum + "bytes");
+        startTime=System.currentTimeMillis();
+        sum = utf8encodeFast(l, sizeInK);
+        endTime=System.currentTimeMillis();
+        System.out.println("Utf8 fast encoding " + sizeInK + "k strings took " + (endTime-startTime) + "ms generating " + sum + "bytes");
+    }
+
+    private long utf8encode(String [] l, int sizeInK) {
+        long sum = 0;
+        for (int i=0; i<1000*sizeInK; i++) {
+            sum += Utf8.toBytesStd(l[i%l.length]).length;
+        }
+        return sum;
+    }
+    private long utf8encodeFast(String [] l, int sizeInK) {
+        long sum = 0;
+        for (int i=0; i<1000*sizeInK; i++) {
+            sum += Utf8.toBytes(l[i%l.length]).length;
+        }
+        return sum;
+    }
+
+    public static void main(String[] args) {
+        new Utf8MicroBencmark().benchmark(10000);
+    }
+
+}