OK....a torrent is not a single download from a central server.
It is getting thousands of little bits and pieces of one or more files from other peoples hard drives.
And while you are downloading all those little pieces, you are also uploading little pieces to other people
Peer 2 peer.
Your download speed depends on how of them there are, and what is their upload speed. It also depends on how many people have the entire file. A 'new' torrent, in which not many people have the entire thing....you will slow down partway through. You and everyone else is trying to get the remainder off those few that have the whole thing.
Finally, it might be your ISP. They do that sometimes.
Oh, and don't download copyrighted files.
Usually, the people that are seeding that torrent (including you) do not have the permission from the owner to actually do that. That is why and how people end up with large, large court fines. Distributing copyrighted material without the license to do so.