If I open: https://lemmy.world/c/[email protected] and https://lemmy.ml/c/lemmy_support in 2 different tabs, I don't see the same posts at all, even with the same sorting option selected.
Is it just because the servers are overloaded and there is some delay in the synchronization?
Yup, this. I can't find a link to explain it, but when you subscribe to a community that your server hasn't seen before, only the latest 20 posts/comments are pulled in.
Yeah it's something that needs fixing since even right now in this thread I might be having a conversation with you but someone else seems completely different comments and not ours, nor are we seeing theirs.
It's unintentional fragmentation further than the one already existing due to federalization.
The ecosystem needs to be more consistent.
It's frustrating - but I think it'll stabilize to some degree once we have more instances that have existed for more than a week or two.