Ahhhh - now you’re talking about performance optimization which is much harder to do because it varies so much depending on the environment and hardware involved.
You might want to search the forum for “performance” and see what others have to say, but most likely you’ll want to try things like:
- disable or lower encryption (you’ve already done that)
- lower
--zip-compression-levelsetting (more space needed at your destination) - increase
--asyncronous-upload-limit(more files queued for upload) - use latest version of Duplicati (though maybe not 2.0.3.6) which include some optimizations and multi-threading updates