Time machine very slow over wireless

My time machine backups are very slow over wireless. Using iPerf3 I tested my wireless link which is pretty good (and normal file transfers speed are "in range") but Time Machine seems to encounter some difficulties on its tasks.

The backup speed can't go over 1Mbit/s, while transfering files can fly over 60Mbit/s pretty easily.

The backup is encrypted, I don't know if this can request some extra-work which slows down the process over wifi but when using a wired connection (NIC over usb-c) the speed is pretty good once again.

Do you have any suggestion?

MacBook Pro (15-inch, Late 2016), macOS High Sierra (10.13.4)

Posted on May 28, 2018 2:46 AM

Posted on May 30, 2018 9:16 AM

For the shake of clarity: yesterday night I figured out what wasn't working properly and now my Time Machine backups works great again.

I have two Time Machine AFP shares on my network NAS (FreeNAS) but I did setup only unix priviledges on write-read access for each user that was supposed to use that share.

I did not setup the "allow list" properly in one of those two shares and - don't ask me why - it seems like the Macbook sometimes tried to use/pool the second share even if it wasn't supposed to access/connect to that share (I can see two network Time Machine disks from System Preferences GUI and obviously for each Mac assigned one share).

When I inhibited not only read-write capabilities but even the access to the wrong disk, suddenly Time Machine stared to work like a charm.

I don't know why over ethernet this issue was not present but that's all.

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Time machine very slow over wireless

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