neoforge optimization mods - 1.21.1 (additional)

Clumps XP orbs together to reduce lag

Optimization mod that focuses on things other than rendering

An efficient and non-locational redstone dust implementation

Completely removes recipe book from the game, optimizing player data.

Attempts to optimize the generation of Jigsaw Structures and NBT pieces

Async particle tick/rendering

Greatly improve your fps with virtually no side-effects on graphics quality

Provides powerful network optimization capabilities for all mainstream systems. Compatibility is a priority.

Improve your Create FPS when shaderpack is on, up to 50%

Advancements optimization mod, updated fork of Icterine with added features

Instanced rendering for entities and block entities using Flywheel

A lightweight entity-tick-scheduler for doubling your TPS.

Buffered raw input and threaded event polling

Distribute HUD updates over multiple frames to improve performance. Now supports 1.21.11!

EXPERIMENTAL: Highly unstable alternative world format for Minecraft. Here be dragons.