Appender is ... slow

[John Colvin via Digitalmars-d-learn]

On Thursday, 14 August 2014 at 17:16:42 UTC, Philippe Sigaud 
wrote:
> From time to time, I try to speed up some array-heavy code by 
> using std.array.Appender, reserving some capacity and so on.
>
> It never works. Never. It gives me executables that are maybe 
> 30-50% slower than bog-standard array code.
>
> I don't do anything fancy: I just replace the types, use 
> clear() instead of = null...
>
> Do people here get good results from Appender? And if yes, how 
> are you using it?

compiler, version, OS, architecture, flags?

Have you looked at the assembly to check that all the Appender 
method calls are being inlined?