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El Capitan 10.11.5 update SMB slow (bug)

Since i upgraded my Macbook Pro Retina 2015 to 10.11.5 SMB transfers speeds to my Synology NAS are not going faster then 25Mbit.

When i use AFP i get 110Mbit speeds to my nas.


Tested a Mac Mini which has 10.11.4 and the SMB and AFP speeds are good 110Mbit.

Upgraded that mac mini to 10.11.5 and i get 25Mbit speed max using SMB!


Seems like bug in the SMB protocol of El Capitan release 10.11.5 😟

MacBook Pro with Retina display, OS X El Capitan (10.11.5)

Posted on May 18, 2016 7:45 AM

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Posted on Jan 3, 2017 9:34 AM

Turn off packet signing for SMB 2 and SMB 3 connections - Apple Support

This answer was posted earlier, but Apple has released a support article specifically for this issue, so I've linked to it here. This resolved my SMB performance issues to my Synology NAS immediately from macOS 10.12.2. Unmount any shares, run through the article, remount your SMB share. Performance should be dramatically improved. Previously it was taking me 30+ min to copy a 4GB file to the NAS. After making the change, it took about 3 min to copy the same file.

130 replies

Jul 21, 2016 5:26 AM in response to SagarMCP

Wow! I just updated to 10.11.6 - the Drobo got waaaaay slower, as in 15mbps instead of 70 which was the slow speed for 10.11.5


Now the NAS is truly useless. Pity. Apple is worse than the Windows world now. First, crashes. Now slower than molasses.


Question: could you post the detail for the root user account login? I will certainly try it if you will.


Tom

Sep 1, 2016 3:21 AM in response to Samplex

Dear Samplex


I am glad to solve your problem as an software engineer. Firstly, i have found that OS X El Capitan seems to appear some bugs or glitches related to the SMB connection. As you may notice that AFP connection is perform more stable and faster and Apple Mac does not natively support SMB protocol. Currently, Apple's Developers is now working on those bugs. Therefore, i have a few solution for you:


1. Use APF connection instead of SMB connection

2. Use FTP or CIFF connection

3. Downgrade from OS X El Capitan to OS X Yosemite ( This option is the most preferred as OS X 10.10 is more stable than El Capitan. )


Last but not least, whatever you succeeded or not please notice me and i will help you to figure that out.


Sincerely,

Ethan The PC Guy

Sep 20, 2016 7:49 AM in response to Samplex

We're also experiencing such problem... worse, no connectivity at all.


  1. All windows computers in the office can connect
  2. All mac computers in the office can connect. EXCEPT the two single computers updated to El Capitan.


All the El Capitan computers can:

  1. reach the local samba server as the can get authenticated (Wrong password is refused)
  2. get authenticated
  3. see the available shares in the connection window.


But... after selecting the share

  • the process dialog never ends.
  • Finder needs to be relaunched eventually to get rid of the dialog.
  • We never see the files.


I tried everything in this thread (AFP, CIFS, changing /etc/nsmb.conf, ). No luck. 😟

For what it's worth, the two ElCapitan computers can SMB together.

Dec 28, 2016 4:00 AM in response to Samplex

MacOS 10.12.2 is also problematic with SMB.

The speed is very very very slow.

The quality of MacOS 10.12 is very poor in facts of networking.

You can have the best Ethernet cable RJ45-RJ45 category 6, the best Gigabit switches, the best NAS-servers with very speedy disks and network card, but the only thing that is POOR is MacOS 10.12.

Because Apple is not able to program a fast SMB protocol, is there a third party product available to speed up the network access from a Mac?

Mac is getting much more expensive, requesting much more adapter to be usable, but is not able to bring quality nor stability.

I hope the guy of Apple with change their way of programming.

Phil

Dec 28, 2016 4:32 AM in response to Samplex

I have problems with buffalo network disk as well, 500mb download is taking like 4minutes and backup upload (multiple files, 100 to 1000) around 500-1gb takes 2-4 days approximately. It is too long to be honest.


Hopefully apple improves this. Link station works great with windows machines but all Apple (mac mini, 2 mac book pros) are having this same awful slow issue. As I'm trying to work with this, 2-4 days is too long time to take backup from daily work.

El Capitan 10.11.5 update SMB slow (bug)

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