The TCP Optimizer is a program designed to provide an easy, intuitive interface for tuning TCP and IP related parameters in the Windows Registry. It takes into account all related RFCs, the Microsoft TCP/IP implementation oddities, verifies all Registry locations for the same TCP/IP parameters (ICS Sharing, AOL protocol MTU, etc), only ads the necessary Registry parameters, and overall aids in making the whole "tweaking for speed" experience a breeze. It is downloadable from here: SG TCP Optimizer.
In the following chapters, you will find short descriptions of all the settings and all aspects of the functionality of the TCP Optimizer. In addition to this documentation, you can also check the TCP Optimizer FAQ, as well as the SG Tweaking forum. We'd also appreciate any feedback about the program, please contact the webmaster or post in our forums with any suggestions for additions or changes to either the program or this documentation.
If you do not feel like reading the entire documentation below, or you simply need the tweaks NOW, without spending time in learning the meaning of all those settings, you can use the Optimizer by following these short instructions:
- Choose your maximum Connection Speed from the slider bar (the maximum available bandwidth, in kilobits per second)
- Choose your Network Interface, or check to Modify All Network Adapters
- Pick "Optimal settings" from the radio-buttons near the bottom of the program
The Optimizer can do all the rest for you (including a backup of the current registry settings, so you can revert the changes if you wish). The new version of the program includes a preview of all changes after hitting the "Apply changes" button and before actually editing the Windows Registry.
You can also use the Optimizer to easily apply custom values, test with different settings, and learn a bit more about tweaking and TCP/IP in general. We strongly recommend getting familiar with the settings, and learning what aspects of your connection they affect first. Also, note that some of the program tabs (Largest MTU, BDP, Latency) can be used as a learning tool without making any changes to the Windows Registry.
The 3 radio buttons at the bottom of the program show the relevant "Current settings" as set in the Windows Registry, the Optimizer recommended "Optimal settings", or allow for "Custom settings" for the more advanced user to test with different values.
Note: You should be logged in with an account with administrative privileges to be able to write to some of the Registry keys and use the program to its full potential.
Network Adapter selection - you should have a list of all present network interfaces in the system. When you select an adapter, using this pull-down menu, its IP address will be shown in the lower-right of this section. Note you can also choose to modify all network adapters at the same time, or tweak without modifying any of their settings.
You also have the option to type a a custom MTU value (that will be used to recommend RWIN). Generally, MTU can safely be set at 1500, however some types of connections, and some routers use smaller values. It is only necessary to edit the MTU value in such special cases. For example, the maximum MTU value for Windows XP PPPoE encapsulation is 1480 (even though other PPPoE implementations can use as high as 1492).
Note: In some rare cases, it is possible that your desired network device is not correctly identified by the Optimizer. That does not affect the program performance much, and you should simply choose "Modify All Network Adapters" in such cases. We'd also appreciate you contacting us with the exact device, so we can improve the program.
This tab contains additional tweaks, that have a smaller, but still noticeable effect on TCP/IP performance. Generally, the tweaks on this page are not directly related to throughput. Some of the tweaks in this section of the Optimizer might be related only to specific aspects of networking, such as Web, or LAN browsing, hostname resolution speed, etc.
By default, the HTTP 1.1 specs allow for only 2 concurrent connections to a Web server. That means, while downloading a web page you can only get 2 files at a time. Note that a single page usually includes tens (sometimes hundreds) of images, each initiating a separate request to the server. Increasing the default to ~10 can provide a considerable visible boost in web page loading time, especially for broadband internet connections. There are two parameters in this section, MaxConnectionsPerServer, and MaxConnectionsPer1_0Server, corresponding to HTTP 1.1 and 1.0, respectively. We recommend setting both to the same number, between 4 and 10.
This section improves DNS and hostname resolution in general. It helps web pages load faster, and has negligible effect on downloads. For more information on what/how this tweak operates, check our Host Resolution Priority Tweak article. We recommend using the Optimal values (5,6,7,8).
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