diff --git a/gruntfile.js b/gruntfile.js
index fbec7ca..8d10d25 100644
--- a/gruntfile.js
+++ b/gruntfile.js
@@ -65,6 +65,18 @@ module.exports = function(grunt) {
           exclude: ["./node_modules/request/index.js"]
         }
       },
+      perf: {
+        src: "./tests/perf/index.js",
+        dest: "./tests/perf/filer-perf-test.js",
+        options: {
+          browserifyOptions: {
+            commondir: false
+          },
+          bundleOptions: {
+            standalone: 'Filer'
+          }
+        }
+      },
       filerTest: {
         src: "./tests/index.js",
         dest: "./dist/filer-test.js"
diff --git a/tests/perf/index.js b/tests/perf/index.js
new file mode 100644
index 0000000..dbebd86
--- /dev/null
+++ b/tests/perf/index.js
@@ -0,0 +1,119 @@
+function setImmediate(cb) {
+  setTimeout(cb, 0);
+}
+
+function parse_query() {
+  var query = window.location.search.substring(1);
+  var parsed = {};
+  query.split('&').forEach(function(pair) {
+    pair = pair.split('=');
+    var key = decodeURIComponent(pair[0]);
+    var value = decodeURIComponent(pair[1]);
+    parsed[key] = value;
+  });
+  return parsed;
+}
+
+require(["Filer", "util"], function(Filer, util) {
+
+  function time(test, cb) {
+    var start = performance.now();
+    function done() {
+      var end = performance.now();
+      cb(end - start);
+    }
+    test(done);
+  }
+
+  var random_data = new Uint8Array(1024); // 1kB buffer
+  var read_buffer = new Uint8Array(1024);
+
+  function run(iter) {
+    iter = (undefined == iter) ? 0 : iter;
+
+    function before() {
+      util.setup(function() {
+        nextTick(during);
+      });
+    }
+
+    function during() {
+      var fs = util.fs();
+
+      window.crypto.getRandomValues(random_data);
+      time(function(done) {
+        fs.mkdir('/tmp', function(err) {
+          fs.stat('/tmp', function(err, stats) {
+            fs.open('/tmp/test', 'w', function(err, fd) {
+              fs.write(fd, random_data, null, null, null, function(err, nbytes) {
+                fs.close(fd, function(err) {
+                  fs.stat('/tmp/test', function(err, stats) {
+                    fs.open('/tmp/test', 'r', function(err, fd) {
+                      fs.read(fd, read_buffer, null, null, null, function(err, nbytes) {
+                        fs.close(fd, function(err) {
+                          fs.unlink('/tmp/test', function(err) {
+                            done();
+                          });});});});});});});});});});
+                        }, after);
+                      }
+
+                      function after(dt) {
+                        util.cleanup(complete.bind(null, iter, dt));
+                      }
+
+                      before();
+                    }
+
+                    var results = [];
+                    function complete(iter, result) {
+                      results.push(result);
+
+                      if(++iter < iterations) {
+                        nextTick(run.bind(null, iter));
+                      } else {
+                        do_stats();
+                      }
+
+                      progress.value = iter;
+                    }
+
+                    function do_stats() {
+                      var output = document.getElementById("output");
+                      var stats = {
+                        mean: ss.mean(results) + " ms",
+                        min: ss.min(results),
+                        max: ss.max(results),
+                        med_abs_dev: ss.median_absolute_deviation(results),
+                      };
+
+                      var t = document.createElement("table");
+                      var tbody = document.createElement("tbody");
+                      var keys = Object.keys(stats);
+                      keys.forEach(function(key) {
+                        var row = document.createElement("tr");
+
+                        var key_cell = document.createElement("td");
+                        var key_cell_text = document.createTextNode(key);
+                        key_cell.appendChild(key_cell_text);
+                        row.appendChild(key_cell);
+
+                        var val_cell = document.createElement("td");
+                        var val_cell_text = document.createTextNode(stats[key]);
+                        val_cell.appendChild(val_cell_text);
+                        row.appendChild(val_cell);
+
+                        tbody.appendChild(row);
+                      });
+
+                      t.appendChild(tbody);
+                      output.appendChild(t);
+                    }
+
+                    var query = parse_query();
+                    var iterations = query.iterations || 10;
+                    var progress = document.getElementById("progress");
+                    progress.max = iterations;
+
+                    run();
+
+});
diff --git a/tests/perf/perf-test.html b/tests/perf/perf-test.html
new file mode 100644
index 0000000..dcd7b4c
--- /dev/null
+++ b/tests/perf/perf-test.html
@@ -0,0 +1,17 @@
+<!DOCTYPE HTML>
+<html>
+  <head>
+    <meta charset="utf-8" />
+  </head>
+  <body>
+    <progress id="progress" value=0></progress>
+    <div id="output"></div>
+    <div id="stderr"></div>
+  </body>
+  <script src="../dist/filer.js"></script>
+  <script type="text/javascript" src="https://rawgithub.com/tmcw/simple-statistics/master/src/simple_statistics.js"></script>
+  <script type="text/javascript" src="http://mbostock.github.com/d3/d3.js"></script>
+  <script type="text/javascript" src="https://ajax.googleapis.com/ajax/libs/jquery/1.7.2/jquery.min.js"></script>
+  <script type="text/javascript" src="./index"></script>
+  <script src="./filer-perf-test.js"></script>
+</html>