You could use i2p for torrent it is free and secure, but slow
For p2p it is better to use i2p, not tor
I recommend you to use ed2k/kad networks. You just have to start the client (emule, aMule or mldonkey) and share the folders. The first time you will need a server.met file, which contains the servers, the ipfilter.dat and also nodes.dat for the kad network.
You could use i2p for bittorrent, it is free, slower but secure.
Yes. It is better to use i2p for bittorrent. Now qbittorrent it is compatible.
If you look on this plex support page, they say you need around 8000 passmark points, if I were you, I will look a cpu which a bare minimum of 10000 passmark points to be fine.
You could try i2p
you could try to use i2pd or i2p for bittorrent with BiblgyBT or qbittorrent 4.6RC and above, there is a few decent public trackers on i2p.
you could use tor project to surf the internet and i2p or i2pd for bittorrent
You still have realvnc lite. It is free, 1 user, 3 machines, less features, but the basics still there.