diff --git a/src/test/org/apache/commons/lang/CharUtilsPerfTest.java b/src/test/org/apache/commons/lang/CharUtilsPerfTest.java
new file mode 100644
index 000000000..30fe576c5
--- /dev/null
+++ b/src/test/org/apache/commons/lang/CharUtilsPerfTest.java
@@ -0,0 +1,164 @@
+/*
+ * Copyright 2004 The Apache Software Foundation.
+ * 
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ * 
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ * 
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.apache.commons.lang;
+
+import java.text.NumberFormat;
+import java.util.Calendar;
+
+/**
+ * Tests the difference in performance between CharUtils and CharSet.
+ * 
+ * Sample runs:
+
+Now: Thu Mar 18 14:29:48 PST 2004
+Sun Microsystems Inc. Java(TM) 2 Runtime Environment, Standard Edition 1.3.1_10-b03
+Sun Microsystems Inc. Java HotSpot(TM) Client VM 1.3.1_10-b03
+Windows XP 5.1 x86 pentium i486 i386
+Do nohting: 0 milliseconds.
+run_CharUtils_isAsciiNumeric: 4,545 milliseconds.
+run_inlined_CharUtils_isAsciiNumeric: 3,417 milliseconds.
+run_inlined_CharUtils_isAsciiNumeric: 85,679 milliseconds.
+
+
+Now: Thu Mar 18 14:24:51 PST 2004
+Sun Microsystems Inc. Java(TM) 2 Runtime Environment, Standard Edition 1.4.2_04-b05
+Sun Microsystems Inc. Java HotSpot(TM) Client VM 1.4.2_04-b05
+Windows XP 5.1 x86 pentium i486 i386
+Do nohting: 0 milliseconds.
+run_CharUtils_isAsciiNumeric: 2,578 milliseconds.
+run_inlined_CharUtils_isAsciiNumeric: 2,477 milliseconds.
+run_inlined_CharUtils_isAsciiNumeric: 114,429 milliseconds.
+
+Now: Thu Mar 18 14:27:55 PST 2004
+Sun Microsystems Inc. Java(TM) 2 Runtime Environment, Standard Edition 1.4.2_04-b05
+Sun Microsystems Inc. Java HotSpot(TM) Server VM 1.4.2_04-b05
+Windows XP 5.1 x86 pentium i486 i386
+Do nohting: 0 milliseconds.
+run_CharUtils_isAsciiNumeric: 630 milliseconds.
+run_inlined_CharUtils_isAsciiNumeric: 709 milliseconds.
+run_inlined_CharUtils_isAsciiNumeric: 84,420 milliseconds.
+
+
+ * @version $Id: CharUtilsPerfTest.java,v 1.1 2004/03/18 22:37:39 ggregory Exp $
+ */
+public class CharUtilsPerfTest {
+    final static String VERSION = "$Id: CharUtilsPerfTest.java,v 1.1 2004/03/18 22:37:39 ggregory Exp $";
+
+    final static int WARM_UP = 100;
+
+    final static int COUNT = 5000;
+
+    final static char[] CHAR_SAMPLES;
+    static {
+        CHAR_SAMPLES = new char[Character.MAX_VALUE];
+        for (char i = Character.MIN_VALUE; i < Character.MAX_VALUE; i++) {
+            CHAR_SAMPLES[i] = i;
+        }
+    }
+
+    public static void main(String[] args) {
+        new CharUtilsPerfTest().run();
+    }
+
+    private void printSysInfo() {
+        System.out.println(VERSION);
+        System.out.println("Now: " + Calendar.getInstance().getTime());
+        System.out.println(System.getProperty("java.vendor")
+                + " "
+                + System.getProperty("java.runtime.name")
+                + " "
+                + System.getProperty("java.runtime.version"));
+        System.out.println(System.getProperty("java.vm.vendor")
+                + " "
+                + System.getProperty("java.vm.name")
+                + " "
+                + System.getProperty("java.vm.version"));
+        System.out.println(System.getProperty("os.name")
+            + " "
+            + System.getProperty("os.version")
+            + " "
+            + System.getProperty("os.arch")
+            + " "
+            + System.getProperty("sun.cpu.isalist"));
+    }
+
+    private void run() {
+        this.printSysInfo();
+        long start;
+        start = System.currentTimeMillis();
+        this.printlnTotal("Do nohting", start);
+        //System.out.println("Warming up...");
+        run_CharUtils_isAsciiNumeric(WARM_UP);
+        //System.out.println("Measuring...");
+        start = System.currentTimeMillis();
+        run_CharUtils_isAsciiNumeric(COUNT);
+        this.printlnTotal("run_CharUtils_isAsciiNumeric", start);
+        //System.out.println("Warming up...");
+        run_inlined_CharUtils_isAsciiNumeric(WARM_UP);
+        //System.out.println("Measuring...");
+        start = System.currentTimeMillis();
+        run_inlined_CharUtils_isAsciiNumeric(COUNT);
+        this.printlnTotal("run_inlined_CharUtils_isAsciiNumeric", start);
+        //System.out.println("Warming up...");
+        run_CharSet(WARM_UP);
+        //System.out.println("Measuring...");
+        start = System.currentTimeMillis();
+        run_CharSet(COUNT);
+        this.printlnTotal("run_inlined_CharUtils_isAsciiNumeric", start);
+    }
+
+    private int run_CharSet(int loopCount) {
+        int t = 0;
+        for (int i = 0; i < loopCount; i++) {
+            for (int j = 0; j < CHAR_SAMPLES.length; j++) {
+                char ch = CHAR_SAMPLES[j];
+                boolean b = CharSet.ASCII_NUMERIC.contains(ch);
+                t += b ? 1 : 0;
+            }
+        }
+        return t;
+    }
+
+    private int run_CharUtils_isAsciiNumeric(int loopCount) {
+        int t = 0;
+        for (int i = 0; i < loopCount; i++) {
+            for (int j = 0; j < CHAR_SAMPLES.length; j++) {
+                char ch = CHAR_SAMPLES[j];
+                boolean b = CharUtils.isAsciiNumeric(ch);
+                t += b ? 1 : 0;
+            }
+        }
+        return t;
+    }
+
+    private int run_inlined_CharUtils_isAsciiNumeric(int loopCount) {
+        int t = 0;
+        for (int i = 0; i < loopCount; i++) {
+            for (int j = 0; j < CHAR_SAMPLES.length; j++) {
+                char ch = CHAR_SAMPLES[j];
+                boolean b = (ch >= '0' && ch <= '9');
+                t += b ? 1 : 0;
+            }
+        }
+        return t;
+    }
+
+    private void printlnTotal(String prefix, long start) {
+        long total = System.currentTimeMillis() - start;
+        System.out.println(prefix + ": " + NumberFormat.getInstance().format(total) + " milliseconds.");
+    }
+}