Any way to use TCP Optimizer to adjust TCP Window on Win 11 ?

Get help and discuss anything related to tweaking your internet connection, as well as the different tools and registry patches on the site. TCP Optimizer settings and Analyzer results should be posted here.
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Any way to use TCP Optimizer to adjust TCP Window on Win 11 ?

Post by rb002 »

Good Morning.

Anyone run into this before ? I'm currently running this setup with TCP Optimizer, and I'm having a hard time trying to change my TCP Window to get increase throughput. I'm hearing that you can't adjust the TCP Window in Win 11.

Device name LAPTOP-0M1GKR3V
Processor Intel(R) Celeron(R) N4020 CPU @ 1.10GHz 1.10 GHz
Installed RAM 4.00 GB (3.81 GB usable)
Device ID 22C71E67-D14B-488A-BFB3-E7FC55581513
Product ID 00356-02696-80075-AAOEM
System type 64-bit operating system, x64-based processor
Pen and touch No pen or touch input is available for this display

Here is my results when I use Speedguide TCP Analyzer...

« TCP Analyzer Results »
Tested on: 2024.01.23 08:03
IP address: 24.138.xx.xx
Client OS/browser: Windows 10 (Chrome

TCP options string: 020405b40103030801010402
MSS: 1460
MTU: 1500
TCP Window: 131328 (not multiple of MSS)
RWIN Scaling: 8 bits (2^8=256)
Unscaled RWIN : 513
Recommended RWINs: 64240, 128480, 256960, 513920, 1027840
BDP limit (200ms): 525 Mbps (53 Megabytes/s)
BDP limit (500ms): 210 Mbps (21 Megabytes/s)
MTU Discovery: ON
TTL: 52
Timestamps: OFF
IP ToS: 00000000 (0)

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Re: Any way to use TCP Optimizer to adjust TCP Window on Win 11 ?

Post by Philip »


There is only small incremental difference between the Windows 10 and 11 TCP/IP implementation, you can apply the "optimal" TCP Optimizer settings under Windows 11 as well.
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Re: Any way to use TCP Optimizer to adjust TCP Window on Win 11 ?

Post by Nikos23 »

Hello! Yes, Philip is right. To configure the TCP window in Windows 11, you can use TCP Optimizer, similar to previous versions of Windows.
Run TCP Optimizer as administrator. To do this, right-click on the program file and select "Run as administrator."
In TCP Optimizer, select the speed of your Internet connection at the top of the window.
Scroll down to the "Advanced Settings" section and find the "TCP Window Auto-Tuning Level" option. Here you can configure the TCP window size.
After making changes, click on the "Apply Changes" button. Restart your computer for the changes to take effect.
Please note that setting the TCP window correctly depends on many factors, including your Internet connection type, latency, speed, and other network parameters. Incorrect settings can reduce the performance of your connection, so it is important to be careful when changing these settings.
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