Speedup Settings for 10 GbE

Introduction

macOS is notorious for asymmetric SMB performance to Unraid/Samba, especially reads, without client and server tuning. Typical culprits:

SMB signing and encryption enabled by default on macOS, adding CPU and latency overhead to reads.
Apple SMB extensions (AAPL / fruit) and Finder metadata lookups, which can severely hurt directory reads and some sequential patterns.
macOS SMB client defaults in /etc/nsmb.conf not optimized for high‑bandwidth, wired 10 GbE connections.

On macOS 15.6.1 (run with sudo ), create or edit /etc/nsmb.conf :

[default]
signing_required=no
mc_on=yes
mc_prefer_wired=yes
protocol_vers_map=6
smb_neg=smb3_only
dir_cache_off=yes