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@cwebber I'm interested to do more big-O comparisons as well.

for a large reply thread, say a thousand actively replying users on hundreds of separate instances, the number of AP messages that need to be rapidly distributed to assemble complete reply-thread view on each instance is pretty huge, no? N^2? and then also fan-out to followers?

each also needs to fetch/render media and social cards (O(instances)). and that doesn't cover *viewers* distinct from participants/followers.