diff --git a/src/test/js/scryptSpeed.js b/src/test/js/scryptSpeed.js
new file mode 100644
index 0000000..f00ade4
--- /dev/null
+++ b/src/test/js/scryptSpeed.js
@@ -0,0 +1,45 @@
+/**
+ * Example command for running this testing utility:
+ * 
+ * <pre>
+ *   jjs -cp ~/.m2/repository/commons-codec/commons-codec/1.10/commons-codec-1.10.jar:target/scrypt-1.4.0.jar scryptTimer.js
+ * </pre>
+ * 
+ * If you don't have commons-codec, use the following command to download with Maven:
+ * 
+ * <pre>
+ *   mvn dependency:get -Dartifact=commons-codec:commons-codec:1.10
+ * </pre>
+ * 
+ */
+
+var SCrypt = com.lambdaworks.crypto.SCrypt;
+var System = java.lang.System;
+var Hex = org.apache.commons.codec.binary.Hex;
+
+var f = Hex.class.getClassLoader().loadClass("com.lambdaworks.crypto.SCrypt").getDeclaredField("native_library_loaded");
+f.setAccessible(true);
+var native = f.get(null);
+System.out.println("Using " + (native ? "Native" : "Java") + " scrypt implementation." );
+
+var startTs = System.currentTimeMillis();
+
+var P, S, N, r, p, dkLen;
+var expected, actual;
+
+P = "pleaseletmein".getBytes("UTF-8");
+S = "SodiumChloride".getBytes("UTF-8");
+N = 1048576;
+r = 8;
+p = 1;
+dkLen = 64;
+expected = "2101cb9b6a511aaeaddbbe09cf70f881ec568d574a2ffd4dabe5ee9820adaa478e56fd8f4ba5d09ffa1c6d927c40f4c337304049e8a952fbcbf45c6fa77a41a4";
+
+actual = SCrypt.scrypt(P, S, N, r, p, dkLen);
+actual = Hex.encodeHexString(actual);
+
+var endTs = System.currentTimeMillis();
+
+System.out.println("expect: " + expected);
+System.out.println("actual: " + actual);
+System.out.println("Time: " + (endTs - startTs) / 1000 + " sec");