diff --git a/reference/dispatch/Dispatch.gwt.xml b/reference/dispatch/Dispatch.gwt.xml
new file mode 100644
index 0000000..fa1c708
--- /dev/null
+++ b/reference/dispatch/Dispatch.gwt.xml
@@ -0,0 +1,6 @@
+<!DOCTYPE document SYSTEM
+    "http://google-web-toolkit.googlecode.com/svn/releases/1.5/distro-source/core/src/gwt-module.dtd">
+<module>
+  <inherits name='com.google.gwt.user.User' />
+  <entry-point class='kellegous.client.Dispatch' />
+</module>
diff --git a/reference/dispatch/client/Dispatch.java b/reference/dispatch/client/Dispatch.java
new file mode 100644
index 0000000..cac6f18
--- /dev/null
+++ b/reference/dispatch/client/Dispatch.java
@@ -0,0 +1,143 @@
+package kellegous.client;
+
+import com.google.gwt.core.client.Duration;
+import com.google.gwt.core.client.EntryPoint;
+import com.google.gwt.core.client.GWT;
+import com.google.gwt.dom.client.DivElement;
+import com.google.gwt.dom.client.Document;
+import com.google.gwt.user.client.Command;
+import com.google.gwt.user.client.Event;
+import com.google.gwt.user.client.EventListener;
+
+public class Dispatch implements EntryPoint {
+  private static native Event createMockEvent() /*-{
+    return { type: "click" };
+  }-*/;
+
+  private static double[] runTrial(int numberOfObservers,
+      int numberOfIterations, int numberOfSamples) {
+    final double[] results = new double[numberOfSamples];
+    final EventListener subject = Subject.create(numberOfObservers);
+    final Event event = createMockEvent();
+    for (int j = 0; j < numberOfSamples; ++j) {
+      final Duration d = new Duration();
+      for (int i = 0; i < numberOfIterations; ++i) {
+        subject.onBrowserEvent(event);
+      }
+      results[j] = d.elapsedMillis();
+    }
+    return results;
+  }
+
+  private static native void schedule(Command command) /*-{
+    $wnd.setTimeout(function() {
+      command.@com.google.gwt.user.client.Command::execute()();
+    }, 0);
+  }-*/;
+
+  // t-distribution for p = 0.05 (used to compute 95% confidence intervals).
+  // This table is based at df = 2.
+  private final static double[] TDIST = new double[] {
+      4.3027, 3.1824, 2.7765, 2.5706, 2.4469, 2.3646, 2.3060, 2.2622, 2.2281,
+      2.2010, 2.1788, 2.1604, 2.1448, 2.1315, 2.1199, 2.1098, 2.1009, 2.0930,
+      2.0860, 2.0796, 2.0739, 2.0687, 2.0639, 2.0595, 2.0555, 2.0518, 2.0484,
+      2.0452, 2.0423, 2.0395, 2.0369, 2.0345, 2.0322, 2.0301, 2.0281, 2.0262,
+      2.0244, 2.0227, 2.0211, 2.0195, 2.0181, 2.0167, 2.0154, 2.0141, 2.0129,
+      2.0117, 2.0106, 2.0096, 2.0086, 2.0076, 2.0066, 2.0057, 2.0049, 2.0040,
+      2.0032, 2.0025, 2.0017, 2.0010, 2.0003, 1.9996, 1.9990, 1.9983, 1.9977,
+      1.9971, 1.9966, 1.9960, 1.9955, 1.9949, 1.9944, 1.9939, 1.9935, 1.9930,
+      1.9925, 1.9921, 1.9917, 1.9913, 1.9908, 1.9905, 1.9901, 1.9897, 1.9893,
+      1.9890, 1.9886, 1.9883, 1.9879, 1.9876, 1.9873, 1.9870, 1.9867, 1.9864,
+      1.9861, 1.9858, 1.9855, 1.9852, 1.9850, 1.9847, 1.9845, 1.9842, 1.9840};
+
+  private static double computeT(int df) {
+    return TDIST[df - 2];
+  }
+
+  private static double computeMean(double[] s) {
+    double sum = 0.0;
+    final int n = s.length;
+    for (int i = 0; i < n; ++i) {
+      sum += s[i];
+    }
+    return sum / n;
+  }
+
+  private static double computeStandardError(double[] data, double mean) {
+    final int n = data.length;
+    double sum = 0.0;
+    for (int i = 0; i < n; ++i) {
+      final double d = data[i] - mean;
+      sum += d * d;
+    }
+
+    return Math.sqrt(sum / n) / Math.sqrt(n);
+  }
+
+  private static class Stats {
+    private final double mean, upper, lower;
+
+    Stats(double[] data) {
+      mean = computeMean(data);
+      final double error = computeStandardError(data, mean);
+      final double t = computeT(data.length - 1);
+      upper = mean + t * error;
+      lower = mean - t * error;
+    }
+
+    @Override
+    public String toString() {
+      return mean + ", " + lower + ", " + upper;
+    }
+  }
+
+  public static class Runner {
+    private int n;
+    private final int max, numIterations, numSamples;
+    private Stats[] results;
+
+    Runner(int min, int max, int numIterations, int numSamples) {
+      n = min;
+      this.max = max;
+      this.numIterations = numIterations;
+      this.numSamples = numSamples;
+      results = new Stats[max - min + 1];
+    }
+
+    void finish() {
+      final Document document = Document.get();
+      final DivElement root = document.createDivElement();
+      document.getBody().appendChild(root);
+      for (int i = 0, n = results.length; i < n; ++i) {
+        final DivElement div = document.createDivElement();
+        root.appendChild(div);
+        div.setInnerText("" + results[i].toString());
+      }
+    }
+
+    void next() {
+      schedule(new Command() {
+        public void execute() {
+          final double[] results = runTrial(n, numIterations, numSamples);
+          Runner.this.results[n] = new Stats(results);
+          if (++n <= max) {
+            next();
+          } else {
+            finish();
+          }
+        }
+      });
+    }
+
+    void run() {
+      next();
+    }
+  }
+
+  public void onModuleLoad() {
+    // Don't run this in hosted mode.
+    if (GWT.isScript()) {
+      new Runner(0, 10, 10000, 20).run();
+    }
+  }
+}
diff --git a/reference/dispatch/client/Subject.java b/reference/dispatch/client/Subject.java
new file mode 100644
index 0000000..fc21bee
--- /dev/null
+++ b/reference/dispatch/client/Subject.java
@@ -0,0 +1,22 @@
+package kellegous.client;
+
+import com.google.gwt.user.client.EventListener;
+import com.google.gwt.user.client.ui.Button;
+import com.google.gwt.user.client.ui.ClickListener;
+import com.google.gwt.user.client.ui.Widget;
+
+public class Subject {
+  public static EventListener create(int numberOfObserver) {
+    final Button subject = new Button("a button");
+    for (int i = 0; i < numberOfObserver; ++i) {
+      subject.addClickListener(new ClickListener() {
+        private int count = 0;
+
+        public void onClick(Widget sender) {
+          count++;
+        }
+      });
+    }
+    return subject;
+  }
+}
diff --git a/reference/dispatch/public/Dispatch.html b/reference/dispatch/public/Dispatch.html
new file mode 100644
index 0000000..e87c244
--- /dev/null
+++ b/reference/dispatch/public/Dispatch.html
@@ -0,0 +1,10 @@
+<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
+<html>
+  <head>
+    <meta http-equiv="content-type" content="text/html; charset=UTF-8">
+    <title>Dispatch5</title>
+    <script type="text/javascript" language="javascript" src="kellegous.Dispatch.nocache.js"></script>
+  </head>
+  <body>
+  </body>
+</html>