In some of our tests, it wasn't uncommon that a 802.11n connection with devices only a few meters apart (and with only wall in between) can fall back to a mere 2-15 Mbps. And here's where you run into problems:
· Is enough for all your basic chatting and mailing services, though it will slow down some content-heavy websites -- especially if you've got a 20+ Mbps downpipe.
· Enough for handling all websites and basic video streaming.
· This is the minimum you need to even consider HD streaming. Even though, the typical bitrate of a 720p iTunes TV show is 2-6Mbps, your router needs to compensate for dropouts, other connected clients and prebuffering.