There are two types of torrent trackers: Public Trackers and Private Trackers.
Public Torrent Tracker: They can be used by anyone adding them as a torrent client. You do not require an invitation or registration for this.
Private Torrent Tracker: They cannot be used by anyone. You require an invitation or registration for the same. They are safer than Public Torrent Tracker. There is a limit to your uploads and downloads.
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The speed of a torrent file is also influenced by other factors. The most significant influence is the user's Industrial Chemical Packaging as established by his or her internet provider.
Other factors also influence the speed of a torrent file. The user's own download speed as determined by his or her internet provider has the biggest effect. Likewise, the speeds of the peers he or she is downloading from have an impact on downloads. I prefer to use pirate Bay for downloading new games
A seed is a user who has downloaded the full copy of the torrent file and is allowing other users to download, or leech, it from him or her
Depends from needs of users