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diff --git a/antlr-3.4/runtime/CSharp3/Sources/Antlr3.Runtime.Test/TestFastLexer.cs b/antlr-3.4/runtime/CSharp3/Sources/Antlr3.Runtime.Test/TestFastLexer.cs
new file mode 100644
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+++ b/antlr-3.4/runtime/CSharp3/Sources/Antlr3.Runtime.Test/TestFastLexer.cs
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+/*
+ * [The "BSD licence"]
+ * Copyright (c) 2005-2008 Terence Parr
+ * All rights reserved.
+ *
+ * Conversion to C#:
+ * Copyright (c) 2008-2009 Sam Harwell, Pixel Mine, Inc.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ * 3. The name of the author may not be used to endorse or promote products
+ *    derived from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
+ * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
+ * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
+ * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
+ * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
+ * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+namespace Antlr3.Runtime.Test
+{
+    using System;
+    using Antlr.Runtime;
+    using Antlr.Runtime.Tree;
+    using Microsoft.VisualStudio.TestTools.UnitTesting;
+    using System.Text;
+
+    [TestClass]
+    public class TestFastLexer
+    {
+        [TestMethod]
+        public void TestBasicFastLexer()
+        {
+            string inputElement = "x-2356*Abte+32+eno/6623+y";
+            StringBuilder builder = new StringBuilder( inputElement, 1000000 * inputElement.Length );
+            for ( int i = 0; i < 999999; i++ )
+                builder.Append( inputElement );
+
+            string text = builder.ToString();
+            int iterations = 5;
+            // warmup
+            IterateFast( text, iterations );
+            Iterate( text, iterations );
+
+            var time = Iterate( text, iterations );
+            var timeFast = IterateFast( text, iterations );
+
+            Console.WriteLine( "Elapsed time (norm): {0} seconds.", time.TotalSeconds );
+            Console.WriteLine( "Elapsed time (fast): {0} seconds.", timeFast.TotalSeconds );
+        }
+
+        TimeSpan Iterate( string text, int count )
+        {
+            DateTime start = DateTime.Now;
+
+            for ( int i = 0; i < count; i++ )
+            {
+                SimpleExpressionLexer lexer = new SimpleExpressionLexer( new ANTLRStringStream( text ) );
+                CommonTokenStream tokens = new CommonTokenStream( lexer );
+                tokens.Fill();
+            }
+
+            return DateTime.Now - start;
+        }
+
+        TimeSpan IterateFast( string text, int count )
+        {
+            DateTime start = DateTime.Now;
+
+            for ( int i = 0; i < count; i++ )
+            {
+                FastSimpleExpressionLexer lexer = new FastSimpleExpressionLexer( new SlimStringStream( text ) );
+                FastTokenStream tokens = new FastTokenStream( lexer );
+                //FastTokenStream<SlimToken> tokens = new FastTokenStream<SlimToken>( lexer );
+                tokens.FillBuffer();
+            }
+
+            return DateTime.Now - start;
+        }
+    }
+}