i think the GW is the firewall filter by keywords, dns and etc.
more info: en.wikipedia.org/wiki/Golden_Shield_Project
I found a very inconsistent transfer speeds on the cifs. speeds between 10mb ~ 110mb
my test env:
esxi 5.5, DSM 4.3 with A9 boot, vRAM 8GB.
E1230 16GB RAM, 256GB SSD (data storage), WD 4TB disk (VMFS), WD 2TB(RDM),
again thank you for your awesome job.