NT Perf Counters benchmark

after.txt

E:\src\node>"c:\Program Files (x86)\Apache Software Foundation\Apache2.2\bin\ab.exe" -t 30 -c 100 http://localhost:8000/bytes/123
This is ApacheBench, Version 2.3 <$Revision: 655654 $>
Copyright 1996 Adam Twiss, Zeus Technology Ltd, http://www.zeustech.net/
Licensed to The Apache Software Foundation, http://www.apache.org/

Benchmarking localhost (be patient)
Completed 5000 requests
Completed 10000 requests
Finished 14867 requests


Server Software:
Server Hostname:        localhost
Server Port:            8000

Document Path:          /bytes/123
Document Length:        123 bytes

Concurrency Level:      100
Time taken for tests:   30.014 seconds
Complete requests:      14867
Failed requests:        0
Write errors:           0
Total transferred:      3648785 bytes
HTML transferred:       1831839 bytes
Requests per second:    495.33 [#/sec] (mean)
Time per request:       201.885 [ms] (mean)
Time per request:       2.019 [ms] (mean, across all concurrent requests)
Transfer rate:          118.72 [Kbytes/sec] received

Connection Times (ms)
              min  mean[+/-sd] median   max
Connect:        0    2   4.9      0      16
Processing:   171  199   9.9    203     250
Waiting:        0  127  51.2    140     250
Total:        172  200   9.9    203     250

Percentage of the requests served within a certain time (ms)
  50%    203
  66%    203
  75%    203
  80%    203
  90%    218
  95%    218
  98%    218
  99%    234
 100%    250 (longest request)

E:\src\node>

before.txt

E:\src\node>"c:\Program Files (x86)\Apache Software Foundation\Apache2.2\bin\ab.exe" -t 30 -c 100 http://localhost:6000/bytes/123
This is ApacheBench, Version 2.3 <$Revision: 655654 $>
Copyright 1996 Adam Twiss, Zeus Technology Ltd, http://www.zeustech.net/
Licensed to The Apache Software Foundation, http://www.apache.org/

Benchmarking localhost (be patient)
Completed 5000 requests
Completed 10000 requests
Finished 14862 requests


Server Software:
Server Hostname:        localhost
Server Port:            6000

Document Path:          /bytes/123
Document Length:        123 bytes

Concurrency Level:      100
Time taken for tests:   30.014 seconds
Complete requests:      14862
Failed requests:        0
Write errors:           0
Total transferred:      3647805 bytes
HTML transferred:       1831347 bytes
Requests per second:    495.16 [#/sec] (mean)
Time per request:       201.953 [ms] (mean)
Time per request:       2.020 [ms] (mean, across all concurrent requests)
Transfer rate:          118.69 [Kbytes/sec] received

Connection Times (ms)
              min  mean[+/-sd] median   max
Connect:        0    2   5.0      0      16
Processing:   172  199   9.1    203     234
Waiting:        0  128  50.0    140     218
Total:        172  200   9.0    203     250

Percentage of the requests served within a certain time (ms)
  50%    203
  66%    203
  75%    203
  80%    203
  90%    203
  95%    218
  98%    218
  99%    218
 100%    250 (longest request)

425 r/s, really? should be more like 7000 unless you are running them on a 486 pc :-)
Did you accidentally benchmark the debug version?