I have had sluggish internet speeds since my UVerse install on Tuesday this week and after troubleshooting, I have now come down to the fact that every time I connect my MacBookPro to my network (wired as well as wireless) the connection speeds on all other devices (iPad, PC and MacBookWhite) are slowing down from 16+Mb and 33ms ping to 1.5Mb and 300-600ms ping..
I have been able to reproduce this using speedtest.net and I can cleary see that as soon as I unplug the MacBookPro from the ethernet cable or disconnect wifi, the speedtest performence will improve dramatically.
No, I've not seen this. I have 2 MacBook Pro noteboos, several iPhones (iPhone 4 and iPhone 5), iPod Touch, and iPad devices all on my home network, as well as an Android tablet, a several ThinkPad notebooks, and a couple of NAS storage devices. I still get 11.8+ Mbps downloads, and 1.45+ Mbps uploads on my UVerse network connection.
Is it possible that you have a bad [static] IP Address configured on your Mac? If you do, you could be causing routing issues on your home network, especially if you are having a collision with your router itself...
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I went to the Apple Store for a Genius ape that appointment. The installed a new internet "location" and that solved the issue. One of my old internet profiles must have had something in there that conflicted as you suggested.