I have once watched a total delay of about 45min of a thread syncing ... however there are some active discussions around that topic, such as here.
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lemmy.world
is basically living in a bubble at the moment, because they are not able to keep up with pushing/publishing their local changes (votes, comments, posts) to the fediverse.
It's on their end: https://lemmy.world/post/758291
And https://lemmy.world/post/15786 talks about it tersely under "Other Issues." See also https://lemmy.world/post/744421.
The instances under heavy load are not super reliable. Older versions of Lemmy make that worse.
Yeah, I just noticed feddit and lemmyworld are still on 0.17.4