poor hsload performance

Uploading a hdf file to hsds using hsload takes a fairly long time.
I have observed this on a small hdf file (<200MB) that contains a lot of groups and attributes.
This particular file takes just about 3 min to upload to a local HSDS instance running an S3 storage backend.
(It has 6 service nodes, but since hsload is sequential, this number should be indifferent).

Since the hsds api is very granular, the number of requests needed to upload my benchmarking shot is about 11000.