One downside you get from encrypting your filesystem is that you can’t boot automatically (at least not without keeping any meaningful modicum of security) since you have to give the machine the passphrase every time it is booted.

To get better performance, you can also just cache the most-used files in RAM; The obvious thing here being that you have to be extra careful about cold-boot attacks, but this applies whenever you use encryption anyways. There’s for instance switches that can ‘tell’ the machine whether the case has been opened so that if this happens you can wipe all sensitive data from the RAM, delete the keyfile and shut down the machine.

Torrent announces give you the total amount upload and downloaded since the last successful announce.

They also give you the torrent client version and the passkey. They do not give you info on who you the person to.

You can check this yourself. Read up on the specs.