One of the great things about lemmy.world's insane user count growth is actual live stress testing of Lemmy software. Instead of having an open question of how Lemmy might scale with large instances, there's now real world production systems providing that opportunity.
The technical issues will pass, but the notion that merely spreading out the load will alleviate them is probably just treating the symptom than the cause.
I suppose from my PoV I see this as very much live testing in production and have adjusted my expectations around that instead of anticipating a wholly seamless experience.