I also put the video itself into a S3 bucket, so PeerTube basically only has to show the meta data and the comments from my server, so kind of like what Mastodon or Lemmy/PieFed has to do. I just had a look at the [PeerTube nginx config((https://github.com/Chocobozzz/PeerTube/blob/develop/support/nginx/peertube) but couldn’t see anything there which would do caching, so I assume the app does it’s own caching somewhere.

For my website, which is a rails application, I did

proxy_cache_path /var/lib/nginx/cache/jeena.net keys_zone=jeenanet:30m;

and then

location @rails {
    # ...
    proxy_cache jeenanet;
}