D speed compared to C++

[Matthew Allen]

I am looking to use D for programming a high speed vision application which was previously written in C/C++. I have done some arbitary speed tests and am finding that C/C++ seems to be faster than D by a magnitude of about 3 times. I have done some simple loop tests that increment a float value by some number and also some memory allocation/deallocation loops and C/C++ seems to come out on top each time. Is D meant to be faster or as fast as C/C++ and if so how can I optimize the code. I am using -inline, -O, and -release. 

An example of a simple loop test I ran is as follows:

DWORD start = timeGetTime();
	int i,j,k;
	float dx=0;
    for(i=0; i<1000;i++)
        for(j=0; j<1000;j++)
            for(k=0; k<10; k++)
                {
                     dx++;
                }
    DWORD end = timeGetTime();

In C++ int and doubles. The C++ came back with a time of 15ms, and D came back with 45ms.