So i was, testing the new snapshot. made a portal with crying obsidian around obsidian and threw a random from the box of inf books. got a world full of endstone, leaves and endermen (screenshot). my preformance went from 300 to 400 fps 15 chunks render distance to 20 to 5 fps 2 render distance. the drop of frames was from the leaves deteriorating.

sorry that is says 20w13b but at the time of writing you can't select 20w14infinite