Lemmy is decentralized, there is no singular Lemmy as a whole unless you’re talking specifically about the server software. As a user you interact with your home instance, in your case lemmy.world.

Most connectivity problems and slowdowns are instance-specific unless you’re talking about a federation problem specifically, for example you posted but it doesn’t show up on other instances, that’s a problem between your instance and the community’s instance.

In your case you most likely just hit something on lemmy.world’s side. Lemmy as a whole is way too small for them to even care about it.