Based on a previous blog, which has been rendered obsolete as I realised lately, here comes the new revision:

To increase the transfer speed between you Mac and your SMB NAS, you will have to change the default configuration of you Mac.

[Update] I figured out some new configurations and updated this post.

Change the file at /etc/nsmb.conf:

[default]
dir_cache_off=yes
signing_required=no
notify_off=yes
protocol_vers_map=4

You may have to reboot your Mac, since the SMB shares appear a bit more persistent than before.

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