I am using an Airport Extreme. I have been noticing that my download and upload speeds are very slow with my IP4 even though the speeds on my MBP are in the 15-25 Megabite range. When I did a speedtest on my Iphone, the speed of the download was about 1/3 of one Megabite. I reset my Airport Extreme to only a/b and g, eliminating the n speeds, but that didn't help. I reset my Network Settings on the IP4( Settings, General, scroll to the bottom and then reset Network Settings). Did it a couple of times and then it finally took. My IP4 speeds are now back to over 10 Megabites for the download.