aussie.zone is just not keeping up with the amount of activities generated on lemmy.world.

it’s not going lower than a week anymore without actively doing something to improve this situation, and once a week all activities older than a week that haven’t been received from LW yet will be discarded on LWs end.

this is most likely mostly caused by latency from LW (finland) to aussie.zone, as lemmy only sends one activity at a time, requiring a round trip across the world for every single activity activity before sending the next one.

there are a couple things that can cause comments to show up on aussie.zone before they would regularly federate, such as someone searching the post/comment url on aussie.zone. some clients will do this automatically if you click a link to a post/comment from another instance.