SpeedGuide.net :: TCP Optimizer / Downloads

SG TCP Optimizer

The TCP Optimizer is a free, easy Windows program that provides an intuitive interface for tuning and optimizing
your Internet connection. There is no installation required, just download and run as administrator.

The program can aid both the novice and the advanced user in tweaking related TCP/IP parameters in Windows,
making it easy to tune your system to the type of Internet connection used. The tool uses advanced algorithms, and the
bandwidth*delay product to find the best TCP Window for your specific connection speed. It provides for easy tuning of
all related TCP/IP parameters, such as MTU, RWIN, and even advanced ones like QoS and ToS/Diffserv prioritization.
The program works with all current versions of Windows, and includes additional tools, such as testing average
latency over multiple hosts, and finding the largest possible packet size (MTU).

The TCP Optimizer is targeted towards broadband internet connections, however it can be helpful with tuning any
internet connection type, from dialup to Gigabit+ 🙂 It is completely free, works with most Windows versions from XP to Windows 11, requires no installation, and has been downloaded over 10 Million times over the years.

If you need help with the program, check the TCP Optimizer documentation,
read our broadband tweaking articles, the Optimizer FAQ,
and/or visit our Forums. The program can be freely (re)distributed, as long as
you give us proper credit as the author, and it is not sold for profit.

TCP Optimizer Download:

TCP Optimizer 4 (latest stable official SG release, works with all current Windows versions)

TCP Optimizer Download Mirrors:

SpeedGuide.net (latest version, recommended)




CHIP Online (German) version 4,

GIGA Software (German)

OS: Windows 9x/ME/2K/XP/2000/Vista/7/2008/8/10/22/2012 Server/2019 Server
version: 4.1.1
date: 2021-01-08
file size: 668 KB

Legacy Versions:

TCP Optimizer v. 3.08 (deprecated, supports versions up to Windows 7/2008 Server, does not support Windows 8/10/2012)

TCP Optimizer v. 2.03 (deprecated, unsupported, released 01/06/2006, supports versions up to Windows XP)

TCP Optimizer v. 1.00 (deprecated, unsupported)

SG Bitcoin


The TCP Optimizer software is completely free to use and distribute. We do not actively seek donations, however, we can accept and appreciate them.
All donations will be used towards software/site development and server/colocation costs. You can donate via Paypal at

, or Bitcoin at 15m4hb1fqqRh7js92qaYDQJP2YHF6jpQFS


SG Windows 7 / Vista / 2008 Misc Downloads

SG Vista TCP/IP Patch – NOT required if using the TCP Optimizer
The SG Vista TCP/IP patch us a quick way to optimize Vista TCP/IP settings for broadband internet connections. It sets both netsh auto

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