How to Use TCP Optimizer on Windows 11 for Faster Internet

How to

Milan Stanojevic

Windows Toubleshooting Expert

How to

3 min. read

Oct 17th, 2025 9:24 AM EEST

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TCP Optimizer is a free tool that tunes Internet settings for better speed, lower latency, and smoother gaming or streaming. Follow these steps to download, configure, and apply the best values.

How do I use TCP Optimizer?

How do I use TCP Optimizer?

What Is TCP Optimizer?

TCP Optimizer, by SpeedGuide.net, lets you adjust advanced TCP/IP parameters like MTU, receive windows, and congestion control without editing the registry. It can help:

Increase download and upload throughput
Reduce ping in online games and calls
Stabilize Wi-Fi and Ethernet connections

Tip for gamers: improving connectivity can also involve NAT changes. See how to change NAT type on PC.

How to Download TCP Optimizer?

Open the SpeedGuide downloads page.
Find TCP Optimizer and click the ZIP or EXE download.
Save the file to your PC.
Right-click the file and choose Run as administrator.

If performance feels off after changes, you can reset the TCP/IP stack in Windows 11 to clear network glitches.

How to Use TCP Optimizer for Best Internet Speed

Use the Optimal preset for a quick, reliable boost. Here is the exact flow:

Select adapter: Choose your active Wi-Fi or Ethernet adapter from the dropdown.
Set connection speed: Drag the slider to match your plan’s download speed.
Pick preset: Select Optimal for recommended values.
Apply and back up: Click Apply Changes and allow a backup when prompted.
Restart PC: Reboot to activate the new settings.

Optional: Advanced Custom Settings

If you want granular control, open Advanced Settings and review:

MTU: Commonly 1500 for Ethernet, 1492 for PPPoE
TCP Window Auto-Tuning: Enables dynamic receive windows
ECN Capability: Usually off for compatibility
QoS: Leave default unless prioritizing traffic

Made extensive tweaks and something broke? You can quickly reset the TCP/IP stack to restore defaults.

Why TCP Optimizer Helps

Windows does not always tune TCP/IP for your exact line speed and hardware. Aligning buffers, MTU, and congestion control with your plan and adapter can:

Lower latency in games and video calls
Improve throughput and page load times
Stabilize flaky Wi-Fi or Ethernet links

FAQs

Is TCP Optimizer safe to use?

Yes. It is widely used and can create a backup before changes.

Do I need to keep it running?

No. Apply settings once, then close it.

Can I restore defaults?

Yes. Use the built-in backup restore or choose Windows Default in the tool.

Does it work for Wi-Fi?

Yes. Optimizations apply to all adapters on the system.

Will Optimal always be best?

For most users yes. Power users can fine-tune Advanced Settings, test, and keep what performs best.

Conclusion

Run TCP Optimizer as administrator, choose the Optimal preset, apply changes, and restart. Test before and after with a speed test to confirm improvements.