When you do, it would be really useful to include the classic fio/bonnie/etc. stuff to break down performance by the type of operation (e.g. file creation / deletion, streaming read/write, random read/write) and block size.

EFS supports NFSv4 so it should avoid being as routinely limited by server round-trip latency as NFSv3 tends to be but it'd be nice to see how well that works in practice.