Improve compression ratio via zopfli

Question

1) I have seen improvement in the compression ratio for gzip using zopfli. However, the again seems to limited by approximately 5%. Is there any mechanism by which compression ratio can be further improved. Are there any configuration parameters which can be changes in zopfli to improve compression ratio

Answer 1

Yes.

gzip does not use zopfli, so you might be using pigz or something else. pigz provides options to change the tuning parameters of zopfli, which you might be able to use to improve compression on your particular data. Look at the --iterations, --maxsplits, --oneblock, and --first options of pigz.