Why is stdin.byLine.writeln so slow?

[Ali Çehreli via Digitalmars-d-learn]

On 06/13/2014 03:02 PM, monarch_dodra wrote:

 > No, it just receives a range, so it does range formating. eg:
 > "[" ~ Element ~ ", " ~ Element ... "]".

It still looks like it could send the formatting characters as well as 
the elements separately to the output stream:

"["
Element
", "
...
"]"

I am assuming that the slowness in OP's example is due to constructing a 
long string.

Ali