Stumbled across this - https://docs.bsky.app/blog/2024-protocol-roadmap - earlier today for reasons. Which seems ambitious and I am unsure how far they will get with that, especially the long-term stuff, but:

Firehose Bandwidth Efficiency: as the network grows, and the volume and rate of repository commits increases, the cost of subscribing to the entire Relay firehose increases. There are a number of ways to significantly improve bandwidth requirements: removing MST metadata for most use-cases; filtering by record types or subsets of accounts; batch compression; etc.

Anyone knows of a comparable roadmap / development outline / ... for #ActivityPub?