Custom String vs D String performance

[Patric via Digitalmars-d-learn]

On Monday, 5 September 2016 at 12:03:49 UTC, Patric wrote:
> On Monday, 5 September 2016 at 11:53:12 UTC, Daniel Kozak wrote:
>> Do you have windows or linux? Which version of dmd you have?
>
> Now on my job pc:
> DMD32 D Compiler v2.071.0-b2
>
> In home i have 64 last version, and with my first version it 
> shows the DString faster than my custom.

Well, if my opBinary implementation is right (in the performance 
sense also), so is a matter of Platform not of implementation, 
and i´m ok with that :)

But I find strange this kind of discrepancy.