It is not unusual that your ISP limit the P2P traffic. As P2P file sharing traffic can constitute up to 75% of all the broadband bandwidth used, IPSs may “optimize” costs by limitting your Torrent traffic.
How do you know if your P2P traffic is limitted?
There is a tool, called Glasnost, that check if your ISP is manipulating your [...]
How to check if your ISP manipulates your Torrent traffic