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. 

 

 

 Quick fix 

 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