I think there’s a short delay. But still that would be on the server hosting the post being overloaded. I’m not 100% familiar with how the protocols work. But when I look at top day from sh.itjust.works vs from Lemmy.world the numbers are the same in my feed. So It must not be a major difference in most posts.
Could also be because of an update not being rolled out to one of the servers. Just a guess.