Slower than Python

[cvk012c]

Tried to port my SIP parser from Python to D to boost performance
but got opposite result.
I created a simple test script which splits SIP REGISTER message
10 million times. Python version takes about 14 seconds to
execute, D version is about 23 seconds which is 1.6 times slower.
I used DMD 2.062 and compiled my script with options -release and
-O. I used Python 3.3 64 bit.
I ran both scripts on the same hardware with Windows 7 64.
Is this general problem with string performance in D or just
splitter() issue?
Did anybody compared performance of D string manipulating
functions with other languages like Python,Perl,Java and C++?


Here is Python version of test script:

import time

message = "REGISTER sip:comm.example.com SIP/2.0\r\n\
Content-Length: 0\r\n\
Contact:
<sip:12345 at 10.1.3.114:59788;transport=tls>;expires=4294967295;events=\"message-summary\";q=0.9\r\n\
To: <sip:12345 at comm.example.com>\r\n\
User-Agent: (\"VENDOR=MyCompany\" \"My User Agent\")\r\n\
Max-Forwards: 70\r\n\
CSeq: 1 REGISTER\r\n\
Via: SIP/2.0/TLS
10.1.3.114:59788;branch=z9hG4bK2910497772630690\r\n\
Call-ID: 2910497622026445\r\n\
From: <sip:12345 at comm.example.com>;tag=2910497618150713\r\n\r\n"

t1 = time.perf_counter()
for i in range(10000000):
    for notused in message.split("\r\n"):
      pass
print(time.perf_counter()-t1)


Here is D version:
import std.stdio,std.algorithm,std.datetime;

void main()
{
    auto message = "REGISTER sip:example.com SIP/2.0\r\n~
Content-Length: 0\r\n~
Contact:
<sip:12345 at 10.1.3.114:59788;transport=tls>;expires=4294967295;events=\"message-summary\";q=0.9\r\n~
To: <sip:12345 at comm.example.com>\r\n~
User-Agent: (\"VENDOR=MyCompany\" \"My User Agent\")\r\n~
Max-Forwards: 70\r\n~
CSeq: 1 REGISTER\r\n~
Via: SIP/2.0/TLS
10.1.3.114:59788;branch=z9hG4bK2910497772630690\r\n~
Call-ID: 2910497622026445\r\n~
From: <sip:12345 at comm.example.com>;tag=2910497618150713\r\n\r\n";

    auto t1 = Clock.currTime();
    foreach(i; 0..10000000)
    {
      foreach(notused; splitter(message, "\r\n"))
      {
      }
    }
    writeln(Clock.currTime()-t1);
}