Some users have problems with connectivity and their upload speed. Not being connectable also affects your download speed.

From this example we can see that seeder is not connectable and regardless of his possible upload capacity this torrent isn't going full speed.
Reason for that is closed port. For those not understanding what port is lets just say that you have closed door and then you are trying to push something through the keyhole. Something like that is happening with your upload or download.
To solve this problem there is very easy guide on
http://www.portforward.comMy suggestion would be that you use really high port number as some ports are used by specific applications so they might not work properly. Best bet would be 60000, easy to remember and it's not reserved for some specific apps.
Also setting up Static IP which is mentioned at the site IS NOT same as Static IP on your ISP.
It's just number from which your PC communicates with your router or modem.