do not download any software that promises to speed up your torrents. You can speed your torrents up by following these steps....
1) forward a port from your router to bit torrent. (u may need to read up on that)
2) go to preferences and set upload limit to 13k this will free up bandwidth.
3) make sure you go for the torrents with the most amount of seeds.
if you have no idea what i mean by these read up on them.
bittorent is a powerful download manager it works good. I have used this for long time but now I am using Ares downloader , it works very well and you can also use Ares Free Download and you can experience its features.