Extremely slow NAS transfers

[ajf.350d]

I've got a Synology DS216j 2 disk NAS which is about 5 years old.
It is all up to date with the latest DSM version available for it.
Up until recently it was used with a Windows machine and no issues with it at all.

I started using a MacBook Pro M1 Pro about 5 months ago and have serious ongoing issues with the performance on the NAS.
Copying files to it and general read requests are extremely slow and even sometimes just fail.
I've looked at various articles regarding SMB settings and cannot see anything wrong with the NAS itself.
I can see the SMB3 connection from the MacBook listed, but one thing I have noticed, if I disconnect that SMB3 connection on the NAS and force a new one to spawn, SOMETIMES the performance improves for a bit.

I also have a Windows 11 VM on the MacBook, and if I use that with the NAS it works perfectly and I get the same kind of performance I previously had on a physical Windows machine.
It has in fact got to the point where I use the VM if I need to copy files to or from the NAS, which isn't ideal to say the least.

Any ideas please?

 

[Bigwaff]

How can I fix slow SMB file transfers on macOS 10.11.5? - Synology Knowledge Center

Synology Knowledge Center offers comprehensive support, providing answers to frequently asked questions, troubleshooting steps, software tutorials, and all the technical documentation you may need.

kb.synology.com

 

[ajf.350d]

Thank you.
I'll have a look at that but think I have already gone through that article and tried setting it.

 

[ajf.350d]

Unfortunately that Synology article didn't work.

 

[TriciaMacMillan]

Isn’t there a known issue with SMB in the last versions of Ventura?

 

[fivenotrump]

How can I fix slow SMB file transfers on macOS 10.11.5? - Synology Knowledge Center

Synology Knowledge Center offers comprehensive support, providing answers to frequently asked questions, troubleshooting steps, software tutorials, and all the technical documentation you may need.

kb.synology.com

signing_required has defaulted to 'no' for a long time.

 

[fivenotrump]

Isn’t there a known issue with SMB in the last versions of Ventura?

Some folks have had problems, others not. It's unclear what the common factors are: I've not looked into it recently as I'm happy with SMB connections to my Synology NAS and other Macs.

 

[ajf.350d]

From what I found, the Ventura specific issues seem to be more that it just doesn't work at all.
For me it is just very slow performance.
I'm going to stop using the Windows VM for a while just on the off chance that is causing some odd 'mix up' somewhere that is affecting speed.
I don't use any other machines with the NAS at present that might affect anything.