I use a Mac from 2017 and my world has been lagging a horrible amount since updating with very low fps that makes it difficult to move or turn around. If Mojang doesn’t release a fix I’m afraid I’ll have to revert back to 1.21.4 where it was working fine and unfortunately be unable to play this new update even though I was really looking forward to it.
I commented on Apr 19, and the problem is still persisting today on May 6. I’m getting about 20 FPS on my MacBook Pro. This is significantly worse performance than 1.21.4, where I was getting around 45-65 in the same area. This happens on multiplayer and singleplayer.
Please fix this issue soon, it’s making it next to impossible for me to play as everything moves so slowly with the lag and it is really disappointing.