/// <summary>
        /// Not an explicit test, just useful to print out some info on performance
        /// </summary>
        public virtual void Performance()
        {
            int[] tokCount  = new int[] { 100, 500, 1000, 2000, 5000, 10000 };
            int[] modCounts = new int[] { 1, 2, 5, 10, 20, 50, 100, 200, 500 };
            for (int k = 0; k < tokCount.Length; k++)
            {
                StringBuilder buffer = new StringBuilder();
                Console.WriteLine("-----Tokens: " + tokCount[k] + "-----");
                for (int i = 0; i < tokCount[k]; i++)
                {
                    //buffer.Append(English.intToEnglish(i).toUpperCase(Locale.ROOT)).Append(' ');
                    buffer.Append(i.ToString(CultureInfo.InvariantCulture)).Append(' ');
                }
                //make sure we produce the same tokens
                TeeSinkTokenFilter teeStream = new TeeSinkTokenFilter(new StandardFilter(TEST_VERSION_CURRENT, new StandardTokenizer(TEST_VERSION_CURRENT, new StringReader(buffer.ToString()))));
                TokenStream        sink      = teeStream.NewSinkTokenStream(new ModuloSinkFilter(this, 100));
                teeStream.ConsumeAllTokens();
                TokenStream        stream  = new ModuloTokenFilter(this, new StandardFilter(TEST_VERSION_CURRENT, new StandardTokenizer(TEST_VERSION_CURRENT, new StringReader(buffer.ToString()))), 100);
                ICharTermAttribute tfTok   = stream.AddAttribute <ICharTermAttribute>();
                ICharTermAttribute sinkTok = sink.AddAttribute <ICharTermAttribute>();
                for (int i = 0; stream.IncrementToken(); i++)
                {
                    assertTrue(sink.IncrementToken());
                    assertTrue(tfTok + " is not equal to " + sinkTok + " at token: " + i, tfTok.Equals(sinkTok) == true);
                }

                //simulate two fields, each being analyzed once, for 20 documents
                for (int j = 0; j < modCounts.Length; j++)
                {
                    int tfPos = 0;
                    //long start = DateTimeHelperClass.CurrentUnixTimeMillis();
                    long start = Environment.TickCount;
                    for (int i = 0; i < 20; i++)
                    {
                        stream = new StandardFilter(TEST_VERSION_CURRENT, new StandardTokenizer(TEST_VERSION_CURRENT, new StringReader(buffer.ToString())));
                        IPositionIncrementAttribute posIncrAtt = stream.GetAttribute <IPositionIncrementAttribute>();
                        while (stream.IncrementToken())
                        {
                            tfPos += posIncrAtt.PositionIncrement;
                        }
                        stream     = new ModuloTokenFilter(this, new StandardFilter(TEST_VERSION_CURRENT, new StandardTokenizer(TEST_VERSION_CURRENT, new StringReader(buffer.ToString()))), modCounts[j]);
                        posIncrAtt = stream.GetAttribute <IPositionIncrementAttribute>();
                        while (stream.IncrementToken())
                        {
                            tfPos += posIncrAtt.PositionIncrement;
                        }
                    }
                    //long finish = DateTimeHelperClass.CurrentUnixTimeMillis();
                    long finish = Environment.TickCount;
                    Console.WriteLine("ModCount: " + modCounts[j] + " Two fields took " + (finish - start) + " ms");
                    int sinkPos = 0;
                    //simulate one field with one sink
                    //start = DateTimeHelperClass.CurrentUnixTimeMillis();
                    start = Environment.TickCount;
                    for (int i = 0; i < 20; i++)
                    {
                        teeStream = new TeeSinkTokenFilter(new StandardFilter(TEST_VERSION_CURRENT, new StandardTokenizer(TEST_VERSION_CURRENT, new StringReader(buffer.ToString()))));
                        sink      = teeStream.NewSinkTokenStream(new ModuloSinkFilter(this, modCounts[j]));
                        IPositionIncrementAttribute posIncrAtt = teeStream.GetAttribute <IPositionIncrementAttribute>();
                        while (teeStream.IncrementToken())
                        {
                            sinkPos += posIncrAtt.PositionIncrement;
                        }
                        //System.out.println("Modulo--------");
                        posIncrAtt = sink.GetAttribute <IPositionIncrementAttribute>();
                        while (sink.IncrementToken())
                        {
                            sinkPos += posIncrAtt.PositionIncrement;
                        }
                    }
                    //finish = DateTimeHelperClass.CurrentUnixTimeMillis();
                    finish = Environment.TickCount;
                    Console.WriteLine("ModCount: " + modCounts[j] + " Tee fields took " + (finish - start) + " ms");
                    assertTrue(sinkPos + " does not equal: " + tfPos, sinkPos == tfPos);
                }
                Console.WriteLine("- End Tokens: " + tokCount[k] + "-----");
            }
        }