I'm trying really hard to like Lemmy, but whenever I'm reading through posts on "active", "hot", etc. it will initially load with the correct content. But then, I get about 10 seconds before the entire list frantically reflows and fills with brand new posts from all over the place. Extraordinarily annoying. I get that creating a new post is itself "activity" which is probably why it does that, I don't think posts of that nature meet the description of "hot".
Maybe I just need to be going by Top->Day