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

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

Instanced rendering for entities and block entities using Flywheel

Advancements optimization mod, updated fork of Icterine with added features

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

Provides powerful network optimization capabilities for all mainstream systems.

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.