Xfinity Forum Archive...
This is an archived section of the community.
Content in this area has been identified as outdated or irrelevant.
This change was done in an effort to make the forum easier to use and to keep only the most helpful and recent content active.
Post your questions in the Xfinity Community
WiFi can be tricky; my iPhone will sometimes get over 600 Mbps on the download speed test, other times it will go no more than 250. That's just the nature of the beast. It's also prone to interference from all kinds of sources, from TVs, microwaves, USB 3 devices, Bluetooth, and anything that emanates RF frequencies, or physical barriers.
If you really want to maximize speed, go into your XB6 Admin Tool or log into xFinity xFi and change the SSID of the 5GHz channel to something else, then connect to that channel instead. Mind you though, the 5GHz band doesn't have the range of the 2.4 GHz band, so you may suffer from loss of coverage. Even then, I wouldn't expect you to suddenly get 700-800 Mbps like I did on my iMac when I had it on WiFi.