Looking at sequential read performance using a varying range of data sizes we see that the DS216+ matches the Asustor AS6202T while being a good bit faster than the QNAP TS-221 and Netgear ReadyNAS RN312.
The sequential write performance is also strong on the DS216+, though the Asustor AS6202T does show a distinct advantage in the 8K test, interestingly.