T wrote:

Hi All, especially Paul,

Would you double check my File Sharing Network Optimization
.reg for typos and if I did anything stupid.

This is aimed at a Windows 11 Pro being set up as a file
server, Calendar sharing based on MySQL, and QuickBooks company
file sharing

Many thanks,
-T

When we ask for advice, we are usually looking for an accomplice.
-- Charles Varlet de La Grange

REGEDIT4
; TCP/IP and File Sharing Network Optimizations with emphasis on Windows 11

; references:
; ChatGPT: registry settings for Windows 11 for TCP/IP Performance Tuning ; https://hstechdocs.helpsystems.com/manuals/globalscape/archive/secureserver3/Windows_Registry_keys_for_TCP_IP_Performance_Tuning.htm

; You MUST look up your NIC-GUID with regedit and modify the NIC-GUID below
; defaults are 0 [HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\Tcpip\Parameters\Interfaces\{NIC-GUID}]
"TcpAckFrequency"=dword:00000001
"TCPNoDelay"=dword:00000001

; Optimize file sharing
; Default = 0
[HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Session
Manager\Memory Management]
"LargeSystemCache"=dword:00000001

; Default = 0 [HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\services\LanmanServer\Parameters]
"Size"=dword:00000003

[HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\AFD\Parameters]

; increase the default number of pending connections that are supported
by the operating system
"EnableDynamicBacklog"=dword:00000001
"MinimumDynamicBacklog"=dword:00000020
"MaximumDynamicBacklog"=dword:00001000 "DynamicBacklogGrowthDelta"=dword:00000010

; This key determines how often TCP repeats keep-alive transmissions
when no response is received (seconds).
"KeepAliveInterval"=dword:00000001

[HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\Tcpip\Parameters]

; This key determines how many times TCP retransmits an unacknowledged
data segment on an existing connection (seconds). "TcpMaxDataRetransmissions"=dword:00000005

; Controls Window Scaling & Timestamps (RFC 1323).
; 0 Disable both
; 1 Enable Window Scaling
; 2 Enable Timestamps
; 3 Enable both (recommended for high-speed networks)
"Tcp1323Opts"= dword:00000003

; Expands ephemeral port range (important for servers) (a.k.a.SOCKETS)
; MaxUserPort default to 4000 (sockets)
; TimesWaitDelay default is 120 (seconds)
; 30 = 0000001e
"MaxUserPort"=dword:0000fffe
"TcpTimedWaitDelay"=dword:0000001e

; Limit TCP receive window size
; 65535 (legacy) 0000FFFF
; 262144 00040000
; 1048576 00100000
"TcpWindowSize"=dword:00100000

; Offloads TCP processing to NIC (often harmful on modern systems)
; 0 Disabled (recommended)
; 1 Enabled
"EnableTCPChimney"=dword:00000000

; Receive Side Scaling (important for multi-core CPUs)
; 0 Disabled (default)
; 1 Enabled
"EnableRSS"=dword:00000001

; Receive Segment Coalescing
; 0 (default)
; 1
"EnableRsc"=dword:00000001

; Time-To-Live for outbound packets
; 64 (default) 00000040
; 128 00000080
"DefaultTTL"=dword:00000080

As far as I can tell (which may very well be wrong though),
you didn't do anything catastrophically wrong from what is above
but a few settings may need adjustment for a Win11 environment.

a. Some no longer have any effect on Windows 10/11
b. Others may reduce performance instead of improving it
c. A few have minor formatting issues
d. While others are redundant with modern NIC offload features

Recommended to KEEP (these still have effects in Windows 11)
a. TcpAckFrequency
b. TCPNoDelay
c. EnableRSS
d. EnableRsc
e. MaxUserPort (optional)
f. TcpTimedWaitDelay (optional)

Safe but mostly unnecessary
a. LanmanServer Size
b. AFD backlog settings

Ignored or obsolete on Windows 10/11
a. LargeSystemCache
b. TcpWindowSize
c. EnableTCPChimney
d. Tcp1323Opts (auto-tuning overrides)
e. TcpMaxDataRetransmissions (default is same)

Notes
a. KeepAliveInterval does nothing unless KeepAliveTime is also set.
b. One typo in your original file: a line break inside the key path
[HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Session Manager\Memory Management]
must be on one line.

Cleaned-up .reg file (ASCII-safe)

Windows Registry Editor Version 5.00

; NIC-specific settings (replace NIC-GUID)
[HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\Tcpip\Parameters\Interfaces\{NIC-GUID}]
"TcpAckFrequency"=dword:00000001
"TCPNoDelay"=dword:00000001

; SMB server tuning
[HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Session Manager\Memory Management]
"LargeSystemCache"=dword:00000001

[HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\LanmanServer\Parameters]
"Size"=dword:00000003

; AFD backlog (optional)
[HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\AFD\Parameters]
"EnableDynamicBacklog"=dword:00000001
"MinimumDynamicBacklog"=dword:00000020
"MaximumDynamicBacklog"=dword:00001000
"DynamicBacklogGrowthDelta"=dword:00000010
"KeepAliveInterval"=dword:00000001

; TCP/IP parameters
[HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\Tcpip\Parameters]
"TcpMaxDataRetransmissions"=dword:00000005
"Tcp1323Opts"=dword:00000003
"MaxUserPort"=dword:0000fffe
"TcpTimedWaitDelay"=dword:0000001e
"TcpWindowSize"=dword:00100000
"EnableTCPChimney"=dword:00000000
"EnableRSS"=dword:00000001
"EnableRsc"=dword:00000001
"DefaultTTL"=dword:00000080

--
Just one person paying it forward by helping others who later help me.

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