Slow SMB writes to Windows shares - buffering?

[njtc]

Wondering if anyone else is experiencing slow SMB writes to a windows 10 share and if a fix has been found? I have an always on Windows machine as a server for several apps and since upgrading to Ventura writing to those disks have become problematic. Reading from those shares is still reasonably fast, but if I try to copy a file to the share I get "preparing to copy.." for a long time (buffering?) then it will start writing and at some point the transfer stalls (buffering again?) then will eventually continue. All worked fine on Monterey.

Tried on two different Macs loaded with Ventura, same result. Ventura to Ventura smb writes have no issue. Read and writes initiated from the windows machine to Ventura have no issues. It's just writes initiated from Ventura to a windows share.

 

[clifftrue]

I am working on a Mac Mini with the same issue. I had a similar issue when upgrading to Monterey. It acted like it was creating/copying the files and there was the spinny wheel for a bit. It did this before with files and folders. Now creating folders on the server share seems to be OK but copying files to the server share have the "preparing to copy" message.

I am copying files to a Windows Server 2012 R2 shares.

I got this working by using this method before.. https://forums.macrumors.com/threads/very-slow-access-to-smb-and-afp-shares.2285822/

Create or update /etc/nsmb.conf (In Terminal type nano /etc/nsmb.conf)

Update to look like this...

[default]
signing_required=no
protocol_vers_map=2

This does not seem to work for Ventura. I have removed them and tried with the same results.

 

[njtc]

Thanks for the suggestion. I tried changing the SMB protocols and turning signing off via the NSMB.conf file, but the issue persists. Not sure what else to try.

 

[njtc]

Just thought id provide an update. I decided to roll back to Monterey and sms shares work perfectly again. I’ll add that thunderbolt nvme speeds are also back to normal. Ventura had cut them in half. Not worth the compromise to move to Ventura at this point.

 

[nquinn]

Did you find any other settings that matter?

I'm trying to copy over wi-fi 5 (TX @ 833Mbps) but only getting 6-7MB/s (40-50Mbps) write speeds.

Not sure if it's related to writing to an NTFS partition.

 

[elmateo487]

Did you find any other settings that matter?

I'm trying to copy over wi-fi 5 (TX @ 833Mbps) but only getting 6-7MB/s (40-50Mbps) write speeds.

Not sure if it's related to writing to an NTFS partition.

Did you find anything? I’m getting slow smb speeds on Monterey…

 

[nquinn]

Did you find anything? I’m getting slow smb speeds on Monterey…

I attached the miniPC to ethernet and now can get around 60-70MB/sec (around 500Mbps). I think I was mostly just running into wi-fi collisions. Surprised me how much impact it had.

 

[elmateo487]

I attached the miniPC to ethernet and now can get around 60-70MB/sec (around 500Mbps). I think I was mostly just running into wi-fi collisions. Surprised me how much impact it had.

Yeah I’m already on Ethernet. I ended up disabling signing and forced SMB 2 and my speeds are fixed

 

[nquinn]

Yeah I’m already on Ethernet. I ended up disabling signing and forced SMB 2 and my speeds are fixed

I actually had also disabled signing beforehand which didn't fix things, but it's possible that /both/ were needed. I stayed on SMB3 though. Wasn't an issue for me.

 

[njtc]

The issue remains unfixed in MacOS 12.3. It's been narrowed down to Windows shares on external drives. Others have confirmed that smb writes to windows 10 shares on an internal drive operate normally (which I was able to replicate), however external (USB in my case) are experiencing issues with slow writes.

I'm still running Monterey until this is fixed.

disabling signing and forcing smb versions does not fix this particular issue.