Windows -> samba - slow write speed

I have a Debian linux machine with samba Version 4.13.13-Debian on a peer-to-peer network. I've just run a LAN speed test, and it gives a considerably slower write speed from Windows -> Debian, than Windows -> Windows. Here are the stats:

Win -> Samba: Write 439.0 Mbps, Read 684.0 Mbps Win -> Win: Write 758.5 Mbps, Read 655.9 Mbps 

Here is the [globals] section of smb.conf

[global] panic action = /usr/share/samba/panic-action %d workgroup = WORKGROUP server string = %h server (Samba %v) passdb backend = tdbsam obey pam restrictions = Yes passwd program = /usr/bin/passwd %u passwd chat = *Enter\snew\sUNIX\spassword:* %n\n *Retype\snew\sUNIX\spassword:* %n\n . log file = /var/log/samba/log.%m max log size = 1000 socket options = TCP_NODELAY dns proxy = No invalid users = root printing = cups printcap name = cups time server = yes dos filetimes = yes fake directory create times = yes dos filetime resolution = yes delete readonly = yes log level = 1 read raw = yes write raw = yes 

I'd welcome any suggestions

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