Yup.

Check to ensure your firewall or router has the appropriate
ports open and forwarded to the correct IP on your local
network. Torrent speeds are greatly impacted if you don't
open those ports up. You can still download the torrent, but
the speed will be agonizingly slow.

The best way I can explain it is it works on a credit system.
As you allow others to pull a file from you they, in turn,
allow you to pull from them. If you have the BT ports sealed
off ( normally for security ) remote clients will not see you
returning the favor and will stop or slow the flow of info to
you soon afterwards.

That would be my first point to check if I were in the
business of doing anything with torrents laugh