Very slow access to SMB and AFP shares — by zorinlynx and others on MacRumors Forums

advancedforumLink only (©)macOS Big SurmacOS Monterey

Big Sur-era thread on slow NAS shares. The main suggestion is adding [default] and signing_required=no to /etc/nsmb.conf, but others report no effect on newer macOS. Also tested: server-side SMB encryption off, iperf3 to separate network from SMB faults, wifi band changes. Turning off signing weakens security; results are mixed.

Quick steps

Create /etc/nsmb.conf with [default] and signing_required=no
Test raw network speed with iperf3

Paraphrased from the source. Menus can differ by version, so check the original for full details.

Read the full thread on forums.macrumors.com

Source: Very slow access to SMB and AFP shares by zorinlynx and others on MacRumors Forums. Licence: Link only (©).

Source reviewed: 2026-11-02
Link checked: 2026-11-02
Tested hands-on: Not by Oddbyte.Me

smbnasnsmb.confslow

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