this post was submitted on 13 Feb 2025
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Likely no. If one person on the instance is subscribed to a remote community, everything is synchronized anyways. If no one is subscribed to the remote community then it's probably a very small and low activity community anyways, which means it's a drop in the bucket difference.
So is a large part of lemmy.world cached on sh.itjust.works' server? Does Pixelfed, Loops or Peertube work the same way? I could see images or video being more of a burden to serve like that. Or does AP sync the metadata like thumbnail, video title, description, comments etc. and the video itself is torrented straight from the host server?
Pretty much, yes. Images is cached. Video is not. However PeerTube supports P2P.