Any lemmy.world user who feels comfortable using the lemmy explorer to subscribe to communities via URL should heavily consider moving to a smaller instance and subscribing to everything they want. It’ll be a much snappier experience, and will very slightly reduce lag for everyone else.
You can find instances on the lemmy explorer linked above, by server location here (just change the software to Lemmy at the top), by user count here, or just look at the official instance list.