Help optimizing UnCompress for gzipped files

[Adam D. Ruppe]

On Tuesday, 2 January 2018 at 10:27:11 UTC, Christian Köstlin 
wrote:
> After this I analyzed the first step of the process (gunzipping 
> the data from a file to memory), and found out, that dlangs 
> UnCompress is much slower than java, and ruby and plain c.

Yeah, std.zlib is VERY poorly written. You can get much better 
performance by just calling the C functions yourself instead. 
(You can just import import etc.c.zlib; it is included still)

Improving it would mean changing the public API. I think the 
one-shot compress/uncompress functions are ok, but the streaming 
class does a lot of unnecessary work inside like copying stuff 
around.