Hello, I just wanted to check in on this list and see what folks know about the new severe performance problems with OS X 10.11.5. There's a long thread on the Apple Support Communities site: https://discussions.apple.com/thread/7565683 There's a comment on Reddit claiming that 10.11.5 is requiring SMB signing, but I haven't found documentation on that: https://www.reddit.com/r/macsysadmin/comments/4l1zq0/os_x_10115_has_caused_severe_smb_performance/d3jo4nd https://support.apple.com/en-us/HT206567 I myself saw performance on my 10 GbE go from 800 MB/s on 10.11.4 to 60 MB/s on 10.11.5. My NAS is running Samba 4.3.6 on FreeNAS, which is a FreeBSD derivative. I'd love the reassurance that whoever can fix this is doing so--either the Apple developers or the Samba developers. Thanks in advance for any information you can provide. Seth Goldin