Yes but now it must wait for acknowledgement of a request (activity), before sending the next one. If one request takes 333ms means you can do max 3 requests per second. Now big instances like lemmy.world have activity above that so instances too far will perpetual lag behind

Mostly because Lemmy has a hard time keeping up with the federation

https://github.com/LemmyNet/lemmy/issues/4529

Yes 🤗, other cats sleep there too sometimes

That list gets generated based on the lemmy instances tracked by fediverse.observer site that have a monthly active user amount greater than 50.