diff --git a/demo/speedtest.html b/demo/speedtest.html
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+<!doctype html>
+<html lang="en">
+<head>
+  <meta charset="utf-8">
+  <meta http-equiv="X-UA-Compatible" content="IE=edge,chrome=1">
+  <title>Simple speed test</title>
+  <meta name="description" content="">
+  <meta name="author" content="">
+
+<script src="../build/convnet.js"></script>
+
+<script>
+
+function logEvent(str) {
+  console.log(str);
+  var d = document.createElement('div');
+  d.innerHTML = str;
+  document.getElementById('result').appendChild(d);
+}
+
+n = 0;
+dtall = 0;
+function runExample() {
+
+  var t0 = +new Date();
+  layer.forward(x);
+  //layer.backward();
+  var t1 = +new Date();
+  var diff = t1 - t0;
+  dtall += diff;
+  n++;
+
+  logEvent('ran example ' + n + ' in ' + diff + 'ms, estimated average = ' + (dtall / n).toFixed(3) + 'ms');
+}
+
+function start() {
+
+  // Conv Layer definition used in convnet benchmarks
+  opt = { in_sx:128, in_sy:128, in_depth:3, sx:11, filters:96, stride: 1, pad: 0};
+  layer = new convnetjs.ConvLayer(opt);
+  x = new convnetjs.Vol(128, 128, 3);
+
+  run1i = setInterval(runExample, 5); // start
+}
+</script>
+</head>
+<body>
+  <button onclick="start()">Convolution Test Start</button>
+  <button onclick="window.clearInterval(run1i);">Stop</button>
+  <div id="result"></div>
+</body>
+</html>
+
+
+
