Most performant way of converting int to string

[cym13 via Digitalmars-d-learn]

On Tuesday, 22 December 2015 at 17:15:27 UTC, Andrew Chapman 
wrote:
> Sorry if this is a silly question but is the to! method from 
> the conv library the most efficient way of converting an 
> integer value to a string?
>
> e.g.
> string s = to!string(100);
>
> I'm seeing a pretty dramatic slow down in my code when I use a 
> conversion like this (when looped over 10 million iterations 
> for benchmarking).
>
> Cheers!

Out of curiosity a slow down compared to what? No conversion at 
all?