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Knowledge document #468

Internet access over the FRITZ!Box is slow

The internet connection on computers, smartphones, and other devices connected to the FRITZ!Box is very slow. As a result, web pages load slowly, it takes a long time to download files, and video streams are not played correctly or are interrupted, for example.

1 Checking the speed of the mobile connection

Check whether the FRITZ!Box displays the speed (throughput) for the mobile connection that was guaranteed by your mobile network provider:

  1. Click "Internet" in the FRITZ!Box user interface.
  2. Click "LTE Information" in the "Internet" menu.
  3. Click on the "Mobile" tab.
  4. Check which speed is displayed in the "Throughput" line.
  5. If the throughput displayed is nearly as high as the speed guaranteed by your mobile network provider, then no error is present.
    • If the throughput displayed is significantly lower, follow the steps in our guide Throughput of the mobile connection is too low.

      Note:In many places, you will not be able to fully achieve the guaranteed throughput. This is why LTE providers say that they offer speeds of "up to" a certain value.

2 Optimizing Wi-Fi connections

The following step is only necessary if Wi-Fi connections to the FRITZ!Box are affected:

  1. Follow the steps in our guide Slow Wi-Fi connection.

3 Adjusting the Windows network settings

In order for a computer to access the internet, all web requests from the computer must be forwarded to the FRITZ!Box. If the computer automatically obtains its IP settings from the FRITZ!Box via DHCP, it also automatically receives a default gateway (IP address of the FRITZ!Box).

Configuring multiple default gateways is not allowed and causes errors. Therefore, make sure that only one single default gateway is configured on the computer:

Note:Note for network experts: Default gateways required for routing to another IP network can be replaced by a static route. Refer to the Windows help for information on setting up static routes.

  1. Press the keyboard shortcut Windows key + R.
  2. Enter cmd in the "Open" field and click "OK".
  3. Enter route print in the command prompt window and press Enter.
  4. If you see several entries in the table with 0.0.0.0, then there is more than one default gateway:

    Windows 11

    1. Click (Start) and then (Settings) in the Windows task bar.
    2. Click "Network & Internet" in the "Settings" menu.
    3. Click "Advanced network settings".
    4. Click "More network adapter options" in the section "Related settings".
    5. Right-click the network adapter that is not connected with the FRITZ!Box.
    6. Click "Properties".
    7. Select "Internet Protocol Version 4 (TCP/IPv4)".
    8. Click "Properties".
    9. If a default gateway was entered, remove it.
    10. Click "OK" to save the settings.

    Windows 10

    1. Click (Start) and then (Settings) in the Windows task bar.
    2. Click "Network & Internet" in the "Settings" menu.
    3. Click "Change adapter options" in the section "Advanced network settings".
    4. Click the arrow next to the (Change view) button in the menu bar and select "Details".
    5. Right-click the connection for a network adapter that is not connected to the FRITZ!Box. The name of the adapter is listed under "Device Name".
    6. Click "Properties".
    7. Select "Internet Protocol Version 4 (TCP/IPv4)".
    8. Click "Properties".
    9. If a default gateway was entered, remove it.
    10. Click "OK" to save the settings.
  5. Repeat these steps for all network adapters that are not connected to the FRITZ!Box.

4 Checking internet applications

VPN connections and applications that monitor or regulate internet access, such as firewalls, virus scanners, parental controls filters, or software that prioritizes individual internet applications, can reduce the speed of the internet connection.

  1. Clear any existing VPN connections and disable all other internet applications for testing purposes.
  2. Test the speed of the internet connection, for example download a large file.
  3. If the internet connection is fast enough now, configure the other applications so that they do not limit the speed of the internet connection. Refer to the manufacturer of the application for information on how to set it up, for example consult the manual.

Now the FRITZ!Box and the devices connected to it establish the fastest possible internet connection. If internet access continues to be too slow, your LTE provider may be throttling your LTE connection or the connection may be interrupted, or there may be a device error if only individual devices are affected. The LTE provider or the manufacturer of the devices in question may be able to give you advice on how to solve the problem.

Important:With LTE connections, all of the mobile device users in an LTE cell share the available bandwidth. The greater the number of users with active connections in a given LTE cell, the less bandwidth is available to each individual user.

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