For me the first loads quickly, the second either keeps loading it results in a server error.

I think this is a genuine error. Why don’t you contact your instance operator?

Hi there! Looks like you linked to a Lemmy community using a URL instead of its name, which doesn’t work well for people on different instances. Try fixing it like this: !worldnews@lemmy.ml

opens for me on the first one, infinite loading on the second one.

lemmy.ml is the home instance of that community and the server itself is probably getting overloaded.

When you’re looking at it from lemm.ee, or any other instance for that matter, you’re seeing a copy of that community served by that instance.

For reasons 😉