Step 1. Login the web-based interface of the modem. Check DSL Status. Please take screenshot of the Status page for further help.

Step 2. Connect only one end-device to the TP-Link modem via cable, and do the Speedtest^® (www.speedtese.net) three times without doing any high bandwidth activities like P2P download. Take screenshots as well.

Step 3. Check wired link speed of the end-device. Skip this step if you don’t know where to find it.

For Windows,

For Mac OS

Locate the Network Utility on your mac: Applications > Utilities > Network Utility. Alternatively, search Network Utility in Spotlight Search.

Step 4. Contact TP-Link support with screenshots of Status page, Speedtest^® results and link speed info, and let us know the total bandwidth from your ISP.

Step 1. Simplify network topology by connecting one end-device to the TP-Link modem via wireless, and do the Speedtest^®（www.speedtest.net）three times without doing any high bandwidth activities like P2P download. Take screenshots.

Step 2. Check wireless link speed of your end-device. Take Screenshots (skip this step if you don’t know where to find it).

For Windows,

For Mac OS

Make sure you select network utility. Select Info tab and choose Wi-fi (en0 or en1) on the drop-down options. Please note that the Link Speed is your wireless connection speed. In this example, my connection speed is set to 450 Mbit/s (Mega bits per seconds).

Step 3

Change Channel Width,2.4GHz→40MHz, 5GHz→80Mhz, refer to here

Go to step 4 if still to no avail.

Step 4

The problem occurs on 5GHz or 2.4GHz? If end-devices support 5GHz as well, connect to 5GHz to check if it’s better or not.

For 2.4GHz, change the Channel (channels 1, 6 and 11 are generally best, but any channel can be used, please try a few more channels). A wireless channel determines which operating frequency will be in use. It is not necessary to change the channel unless you’re noticing interference problems with nearby wireless networks. 

Step 5

Contact TP-Link support with the above results for further help and let us know the operating system of end-device you use and total bandwidth or wired speed that you test.