How do I Increase ADSL Speed?

Written by cameron easey
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How do I Increase ADSL Speed?
ADSL modems can be optimised by making tweaks in the Windows registry. (back side of a modem image by timur1970 from

Accessing the Internet on an ADSL modem may seem slow, especially if you are setting up a modem on your computer for the first time. Increasing the speed of your ADSL is done by making a change to the TCP/IP connection settings by editing the Windows registry. The default values for these registry keys may not always be set to the optimum setting. Edit the registry with the Windows Registry Editor or by using the Dr. TCP program.

Skill level:


    Windows Registry Editor

  1. 1

    Click the Start menu and then select the "Run" option. Type "regedit" into the text box and then click the "OK" button. You may also press the "Enter" key. This will open the Windows Registry Editor.

  2. 2

    Click the "+" sign next to "HKEY_CURRENT_USER" to display the folder list. Navigate to Software, Microsoft, Windows, Current Version and then Internet Settings.

  3. 3

    Right-click on the registry value for "MaxConnectionsPerServer." Select "Modify" from the context menu and select "Decimal" in the base section. Change the value in the text box to 6. Click the "OK" button to save the change.

  4. 4

    Right click on the registry value for "MaxConnectionsPer1_0Server." Select "Modify" from the context menu and select "Decimal" in the base section. Change the value in the text box to 8. Click the "OK" button to save the change.

  5. 5

    Select the File drop-down menu and then click "Exit" to close the Registry Editor.

    Dr. TCP Utility

  1. 1

    Go to the Dr. TCP download page at DSLReports. Click the "DRTCP021.exe" file and save it to your desktop. Double-click the downloaded file to install the program.

  2. 2

    Double-click the Dr. TCP icon on your desktop to open the program.

  3. 3

    Change the value for Tcp Receive Window by entering 65535 into the text box. Change the options for Window Scaling, Time Stamping, Selective Acks, Path MTU Discovery and Black Hole Detection all to "Default."

  4. 4

    Remove the value for Max Duplicate Acks, and TTL so they are both blank.

  5. 5

    Click the arrow to display the drop-down selections for Adapter Settings. Select your adaptor type from the options provided. This will be the adaptor for your high-speed Internet or ADSL connection.

  6. 6

    Change the value for IPMTU by entering 1500 into the text box. Click the "Apply" button to save the changes to the registry.

  7. 7

    Reboot your computer for the changes that were made to the registry to take effect.

Tips and warnings

  • Export a copy of the registry from the File drop-down menu as a backup before making any changes
  • The acronym TCP/IP stands for Transmission Control Protocol/Internet Protocol.

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