rsync many small files

[Mag Gam]

At our lab we have storage with many small files. For example a
directory can contain over 15,000 files and each file averages about
75k. I would like to sync this to another filesystem on a different
server but I am not sure if there is a rsync tuning flag I can use for
such a intensive job. I am using rsync 3.0.3. Also, I would like to
use little memory as possible.

Any thoughts? TIA