You should be aware of the factors that can impact download speed. Some of the common ones are many devices connected at the same time, multiple devices streaming, gaming, or downloading large files, the age and type of devices, and Wi-Fi signal strength all can affect speed.  You should check the internet speed with the ‘speed check’ utility that AT&T makes available. In addition, you should review your plan to figure out if it is the most suitable one for your projected usage, and adjust/ upgrade if required.