It uses P2P when multiple users is watching the same video. A PeerTube server can also mirror another PeerTube server's videos and function as a peer.
You can see it this screenshot, that I've downloaded most of the video data from other peers.
PeerTube is build on ActivityPub, just like Lemmy. Right now federation is broken between Lemmy and PeerTube. When it's fixed, you'll be able to subscribe to PeerTube channels from here and comment as well.
What "boxes" are you talking about here, when signing up on a Lemmy provider?
Mastodon and Lemmy is different software, serving two different functions, but they are connected. So it is possible for a user on Mastodon to create and comment on posts from Mastodon, on Lemmy.
If you follow this link to Mastodon.social, you can see this post and our comments.
Think about instances as email providers. You pick a provider (feddit.dk, feddit.uk, lemmy.wtf etc.) to access everything from all the other Lemmy providers + the rest of "the Fediverse", which fx consists of Mastodon, PeerTube and Pixelfed.
Was it on Feddit.dk you had issues with slow emails? That might be something the admin, @SorteKanin@feddit.dk should look into.
A bunch of communities were created at the last Reddit exodus and left to die. Buuut some of the communities might have moved to another Lemmy server or simply died out because the same community exists on another Lemmy server.
It uses P2P when multiple users is watching the same video. A PeerTube server can also mirror another PeerTube server's videos and function as a peer.
You can see it this screenshot, that I've downloaded most of the video data from other peers.
PeerTube is build on ActivityPub, just like Lemmy. Right now federation is broken between Lemmy and PeerTube. When it's fixed, you'll be able to subscribe to PeerTube channels from here and comment as well.