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@bnewbold Interesting! IIRC one of the early Twitter papers had great findings on how they handled sorting. Broadcasting is easier.

I can easily believe a single centralised relay is more efficient (as long as it fits the biggest machine you can get). A few dozens relays sounds reasonable; 10k (the number of Mastodon servers) less so. Relays would need to be pooled resources. A managed service à la masto.host would offer just one, shared by hundreds/thousands of customers.