ClientEngine.TotalDownloadSpeed
ClientEngine.TotalUploadSpeed
To get statistics of a torrrent you use the ConnectionMonitor object.
It is available with torrentManager.Monitor
Here is list of what you can get:
You can get detail about each peer in TorrentManager.GetPeers() or from a peerId get in an event.
To get statistics of this particular peer you use the ConnectionMonitor object (same than torrent).
It is available with PeerId.Monitor