@wakest Subscription is a mechanism that, from among the statuses posted and distributed to the server, those that match the conditions are poured into the timeline. Limit visibility to public ones only.
Mostly the same as the Federation Timeline, but also includes boosts and replies.
Therefore, it is most effective on the server where many posts are distributed.
I run a service that only relays posts with hashtags. This relay is useful for hashtag subscriptions.
https://hashtag-relay.dtp-mstdn.jp