Strange measurements when reproducing issue 5650

[SomeDude]

On Wednesday, 25 April 2012 at 17:06:00 UTC, SomeDude wrote:
> On Wednesday, 25 April 2012 at 15:35:44 UTC, Steven 
> Schveighoffer wrote:
>> On Wed, 25 Apr 2012 07:27:29 -0400, SomeDude 
>> <lovelydear at mailmetrash.com> wrote:
>>
>>> On Wednesday, 25 April 2012 at 08:34:40 UTC, SomeDude wrote:
>>>
>>> Noone reproduces this ?
>>
>> On my linux box, it runs in about 580ms, with or without the 
>> writeln.
>>
>> This is what I would expect.
>>
>> But things can be strange when dealing with GC timings.  Have 
>> you tried profiling the code to see where the time is being 
>> added?
>>
>> -Steve
>
> Did you compile with  dmd -O -inline -release ?
>
> I'll do some profiling later.

OK, I'm having a hard time producing data that support what I see 
without profiling on, but it's still quite consistent accross 
runs. I dunno what's wrong here.