I dislike the addition of pig/chicken variants, leaf litter, and happy ghasts, so I play on 1.21.4 with the recipe book turned off, the mods included here, and my custom datapack rebalancing the whole game. All the performance, HUD, info, and balance mods that I use to fine-tune vanilla survival are included.
The main feature is my custom datapack. (downloaded separately) Check the gallery for images of the new worldgen. Also turn on the experimental villager trade rebalance.
For PRISTINE performance use whatever the appropriate java launch arguments are for your situation, described here, and then spend some time configuring all the performance mods in game.
