Since you mentioned that you are experiencing slow speed issue with AT&T DSL services, I would like to explain that, there are many reasons due to which you may be experiencing slow surfing speeds.
The speed of the connection depends on many factors like heavy Internet usage or Internet traffic. If there is heavy Internet traffic, the speed will drop accordingly. When the Internet usage is low (during off peak hours) the speed will increase. It will never stay at the maximum value.
I would suggest you to check your AT&T current Internet speed before performing trouble shooting steps mentioned below.
Disable any peer-to-peer or other applications running in the background that may be using up your bandwidth.
Make sure your wireless network is set up for optimal performance. Keep your wireless gateway/router away from physical obstructions. Place the gateway/router in a central location, at least 3 feet away from other appliances.
After performing above steps, if you experiencing any issue regarding slow speed, I would suggest you please, contact AT&T voice technical help desk at 1-877-722-3755 (open 24/7) and troubleshoot according to their recommendation if require they will perform a line test on your AT&T DSL line and help you accordingly.
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*I am an AT&T employee and the postings on this site are my own and don't necessarily represent AT&T's position, strategies or opinions.