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Slow SMB performance with MacOS X clients while AFP performance is good

Article ID: 2911
Last updated: 07 Sep, 2017

PROBLEM: Slow SMB performance with MacOS X clients while AFP performance is good

EXAMPLE: With MacOS X clients (OS version 10.12.6) there is a significant speed differences between AFP and SMB.
With AFP up to 780MB/s, while over SMB only up to 80 MB/s (which is roughly as much as a 1Gbit connection can take).

SOLUTION: It seems that Apple still has not fixed their "quick and dirty" fix for Badlock as described in this thread: El Capitan 10.11.5 update SMB slow (bug)

If you believe that your network is secure from man-in-the-middle attacks and the Badlock bug, then you can disable client signing.


  1. Create a nsmb.conf file in /etc with vim. sudo will be required.
  2. Write into the file:



Then restart your machine. Your SMB3 speeds should be comparable to AFP again.

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Article ID: 2911
Last updated: 07 Sep, 2017
Revision: 1
Views: 974
Posted: 07 Sep, 2017 by Stolarczyk M.
Updated: 07 Sep, 2017 by Kula T.
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