Help optimizing UnCompress for gzipped files

[Christian Köstlin]

Hi all,

over the holidays, I played around with processing some gzipped json
data. First version was implemented in ruby, but took too long, so I
tried, dlang. This was already faster, but not really satisfactory fast.
Then I wrote another version in java, which was much faster.

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.

There was some discussion on the forum a while ago:
http://forum.dlang.org/thread/pihxxhjgnveulcdtadvg@forum.dlang.org

The code I used and the numbers I got are here:
https://github.com/gizmomogwai/benchmarks/tree/master/gunzip

I used an i7 macbook with os x 10.13.2, ruby 2.5.0 built via rvm,
python3 installed by homebrew, builtin clang compiler, ldc-1.7.0-beta1,
java 1.8.0_152.

Is there anything I can do to speed up the dlang stuff?

Thanks in advance,
Christian