My experience with this is that it seems to be instance-based. I’m a member of both lemmy.world and lemm.ee, and I sing lemmy.world, wefwef was very laggy. I read here that lemm.ee had received some speed-related infrastructure updates, so I decided to test it out. It’s honestly like night and day. Everything loads quickly, and I’m able to comment and upvote where I couldn’t before!