This is affecting 1.19.41. This is a big parity difference
I am experiencing this issue as well. This video demonstrates game breaking performance since the hotfix: https://youtu.be/JfXGWnVjZPc
https://youtu.be/JfXGWnVjZPc video link demonstrating performance
Confirmed. This is happening on my world as well.
I'm having same issue on PS4. Chunks are loading significantly slower since updating to 1.19.30. It's unplayable to fly with elytra at normal speeds due to chunks not loading in. Missing/invisible chunks everywhere and after flying about two hundred blocks the world will cease to load entirely, forcing me to land and wait for the world to become visible.
Still an issue in 1.20.40. I would really like to see this changed. It is a pain to have only one person able to change the difficulty.