diff --git a/benchmarks/read-integration-mock.js b/benchmarks/read-integration-mock.js
new file mode 100644
index 00000000..1fdd26ef
--- /dev/null
+++ b/benchmarks/read-integration-mock.js
@@ -0,0 +1,25 @@
+var assert = require('assert');
+var fs = require('fs');
+
+var mock = require('..');
+
+
+/**
+ * Timed test.  This includes the mock setup and teardown as part of the overall
+ * test time.
+ * @param {function(Error)} done Callback.
+ */
+exports.test = function(done) {
+  mock({
+    'foo-mock.txt': 'foo'
+  });
+
+  fs.readFile('foo-mock.txt', 'utf8', function(err, str) {
+    assert.ifError(err);
+    assert.equal(str, 'foo');
+
+    mock.restore();
+    done();
+  });
+
+};
diff --git a/benchmarks/read-integration-real.js b/benchmarks/read-integration-real.js
new file mode 100644
index 00000000..05d8573d
--- /dev/null
+++ b/benchmarks/read-integration-real.js
@@ -0,0 +1,28 @@
+var assert = require('assert');
+var fs = require('fs');
+var path = require('path');
+
+var rimraf = require('rimraf');
+
+var tmpPath = '.tmp';
+
+
+/**
+ * Timed test.  This includes the setup and teardown as part of the overall
+ * test time.
+ * @param {function(Error)} done Callback.
+ */
+exports.test = function(done) {
+  fs.mkdir(tmpPath, function(mkdirErr) {
+    assert.ifError(mkdirErr);
+    var tmpFile = path.join(tmpPath, 'foo-real.txt');
+    fs.writeFile(tmpFile, 'foo', function(writeErr) {
+      assert.ifError(writeErr);
+      fs.readFile(tmpFile, 'utf8', function(readErr, str) {
+        assert.ifError(readErr);
+        assert.equal(str, 'foo');
+        rimraf(tmpPath, done);
+      });
+    });
+  });
+};
diff --git a/benchmarks/read-mock.js b/benchmarks/read-mock.js
new file mode 100644
index 00000000..80d7ddf5
--- /dev/null
+++ b/benchmarks/read-mock.js
@@ -0,0 +1,35 @@
+var assert = require('assert');
+var fs = require('fs');
+
+var mock = require('..');
+
+
+/**
+ * Test setup.  Not timed.
+ */
+exports.beforeEach = function() {
+  mock({
+    'foo-mock.txt': 'foo'
+  });
+};
+
+
+/**
+ * Timed test.
+ * @param {function(Error)} done Callback.
+ */
+exports.test = function(done) {
+  fs.readFile('foo-mock.txt', 'utf8', function(err, str) {
+    assert.ifError(err);
+    assert.equal(str, 'foo');
+    done();
+  });
+};
+
+
+/**
+ * Test teardown.  Not timed.
+ */
+exports.afterEach = function() {
+  mock.restore();
+};
diff --git a/benchmarks/read-real.js b/benchmarks/read-real.js
new file mode 100644
index 00000000..2b1067ae
--- /dev/null
+++ b/benchmarks/read-real.js
@@ -0,0 +1,43 @@
+var assert = require('assert');
+var fs = require('fs');
+var path = require('path');
+
+var rimraf = require('rimraf');
+
+var tmpPath = '.tmp';
+
+
+/**
+ * Test setup.  Not timed.
+ * @param {function(Error)} done Callback.
+ */
+exports.beforeEach = function(done) {
+  fs.mkdir(tmpPath, function(err) {
+    if (err) {
+      return done(err);
+    }
+    fs.writeFile(path.join(tmpPath, 'foo-real.txt'), 'foo', done);
+  });
+};
+
+
+/**
+ * Timed test.
+ * @param {function(Error)} done Callback.
+ */
+exports.test = function(done) {
+  fs.readFile(path.join(tmpPath, 'foo-real.txt'), 'utf8', function(err, str) {
+    assert.ifError(err);
+    assert.equal(str, 'foo');
+    done();
+  });
+};
+
+
+/**
+ * Test teardown.  Not timed.
+ * @param {function(Error)} done Callback.
+ */
+exports.afterEach = function(done) {
+  rimraf(tmpPath, done);
+};
diff --git a/benchmarks/write-integration-mock.js b/benchmarks/write-integration-mock.js
new file mode 100644
index 00000000..0505c5ed
--- /dev/null
+++ b/benchmarks/write-integration-mock.js
@@ -0,0 +1,22 @@
+var assert = require('assert');
+var fs = require('fs');
+
+var mock = require('..');
+
+
+/**
+ * Timed test.  This includes the mock setup and teardown as part of the overall
+ * test time.
+ * @param {function(Error)} done Callback.
+ */
+exports.test = function(done) {
+  mock();
+
+  fs.writeFile('foo-mock.txt', 'foo', function(err) {
+    assert.ifError(err);
+
+    mock.restore();
+    done();
+  });
+
+};
diff --git a/benchmarks/write-integration-real.js b/benchmarks/write-integration-real.js
new file mode 100644
index 00000000..f36f4b45
--- /dev/null
+++ b/benchmarks/write-integration-real.js
@@ -0,0 +1,23 @@
+var assert = require('assert');
+var fs = require('fs');
+var path = require('path');
+
+var rimraf = require('rimraf');
+
+var tmpPath = '.tmp';
+
+
+/**
+ * Timed test.  This includes the setup and teardown as part of the overall
+ * test time.
+ * @param {function(Error)} done Callback.
+ */
+exports.test = function(done) {
+  fs.mkdir(tmpPath, function(mkdirErr) {
+    assert.ifError(mkdirErr);
+    fs.writeFile(path.join(tmpPath, 'foo-real.txt'), 'foo', function(err) {
+      assert.ifError(err);
+      rimraf(tmpPath, done);
+    });
+  });
+};
diff --git a/benchmarks/write-mock.js b/benchmarks/write-mock.js
new file mode 100644
index 00000000..c7838389
--- /dev/null
+++ b/benchmarks/write-mock.js
@@ -0,0 +1,29 @@
+var fs = require('fs');
+var path = require('path');
+
+var mock = require('..');
+
+
+/**
+ * Test setup.  Not timed.
+ */
+exports.beforeEach = function() {
+  mock();
+};
+
+
+/**
+ * Timed test.
+ * @param {function(Error)} done Callback.
+ */
+exports.test = function(done) {
+  fs.writeFile('foo-mock.txt', 'foo', done);
+};
+
+
+/**
+ * Test teardown.  Not timed.
+ */
+exports.afterEach = function() {
+  mock.restore();
+};
diff --git a/benchmarks/write-real.js b/benchmarks/write-real.js
new file mode 100644
index 00000000..68534ff2
--- /dev/null
+++ b/benchmarks/write-real.js
@@ -0,0 +1,33 @@
+var fs = require('fs');
+var path = require('path');
+
+var rimraf = require('rimraf');
+
+var tmpPath = '.tmp';
+
+
+/**
+ * Test setup.  Not timed.
+ * @param {function(Error)} done Callback.
+ */
+exports.beforeEach = function(done) {
+  fs.mkdir(tmpPath, done);
+};
+
+
+/**
+ * Timed test.
+ * @param {function(Error)} done Callback.
+ */
+exports.test = function(done) {
+  fs.writeFile(path.join(tmpPath, 'foo-real.txt'), 'foo', done);
+};
+
+
+/**
+ * Test teardown.  Not timed.
+ * @param {function(Error)} done Callback.
+ */
+exports.afterEach = function(done) {
+  rimraf(tmpPath, done);
+};
diff --git a/package.json b/package.json
index d2e96eca..1e9656d1 100644
--- a/package.json
+++ b/package.json
@@ -31,13 +31,16 @@
   ],
   "scripts": {
     "debug": "node --debug-brk ./tasks.js test",
-    "test": "node ./tasks.js lint test"
+    "test": "node ./tasks.js lint test",
+    "bench": "bench benchmarks"
   },
   "devDependencies": {
     "chai": "~1.8.1",
     "jshint": "~2.4.1",
     "mocha": "~1.17.0",
-    "glob": "~3.2.8"
+    "glob": "~3.2.8",
+    "rimraf": "~2.2.6",
+    "bench-it": "~0.1.0"
   },
   "dependencies": {
     "rewire": "~2.0.0"