All your connected and active devices share your Internet connection.
The more devices downloading, streaming, or gaming, the more likely you
could notice slower speeds. To get a higher speed on the speed test, try
cutting back the number of connected devices like these:
Note that security cameras (nanny cams or pet cams) can also affect performance.
For best results, connect the device running the speed test directly to the AT&T gateway with an Ethernet cable. Wi-Fi connection speeds may be slower than the Internet plan you purchased. Typical wireless G network speeds will not be faster than 25Mbps. Even if your router is N- or ac-capable, your smartphone, tablet, laptop, or other device may not be. Check with the manufacturer to find out.
How to maximize your home networking speeds?
Connecting your computer directly to your AT&T-provided modem or router will give the most accurate speed test results.
How do I disconnect a single-user modem from a router or switch and connect it directly to the computer?
Power cycle your modem/router
Turning the power to your modem or router off and on again will reset your connection, which may improve your performance.
How can I power cycle my DSL modem and computer?
Install line filters
Are you a DSL or U-verse High Speed Internet customer with traditional telephone service? Be sure to have line filters installed on all analog devices connected to your phone line. Analog devices include phones, alarm systems, and medic alert boxes. Line filters can become defective, so try testing with your phones and filters disconnected.
How do I install line filters?