[benchmarks] Improvements.
[benchmarks] Improvements.

neurodata/ndstore,openconnectome/open-connectome,openconnectome/open-connectome,neurodata/ndstore,openconnectome/open-connectome,openconnectome/open-connectome,neurodata/ndstore,neurodata/ndstore,openconnectome/open-connectome,openconnectome/open-connectome