So here is a very odd situation. I'm using Mint 13 Maya on a netbook, a Windows 7 on a laptop and a tablet pc. All of them sharing a Wifi network at home.
When I'm connected to the network with Mint, the internet connection goes very very slow on the other devices connected to the network. If I disable the networking or (shut down), the other devices get regular speed, and, if I enable the networking again, the other devices go slow again.. It appears that Mint is taking most of the bandwidth or something like that (not downloading, torrent, streaming, etc)