I have been using Lemmy for 20 days, at first I opened an account at Lemmy.world because you can join without writing a text and waiting approval. I have been enjoying the experience overall but despite the admin teans best efforts Lemmy.world has been experiencing some serious performance issues. If you want to avoid that join a smaller instance, preferably hosted in your country. I joined discuss.tchncs.de today and everything is so much faster it has added benefit of being able to see beehaw.org posts too. It will improve not only your but all other Lemmy.world users experience too.
So if I host my instance but subscribe to communities on lemmy.world do I actually lessen the load on lemmy.world because it only has to deal with the API calls from my instance instead of having to serve me a full fat UI? (damn that was a long sentence!)