How to loop through characters of a string in D language?

[bauss]

On Monday, 13 December 2021 at 05:46:06 UTC, forkit wrote:
> On Saturday, 11 December 2021 at 09:25:37 UTC, Ola Fosheim 
> Grøstad wrote:
>>
>> ```putchar(…)``` is too slow!
>>
>>
>
> On planet Mars maybe, but here on earth, my computer can do 
> about 4 billion ticks per second, and my entire program (using 
> putchar) takes only 3084 ticks.

Can I borrow a couple of your ticks?