Performo

Particle optimizations: Culling, rendering optimizations, configurable particle-type-specific spawn reduction, and potion particle disabling. Compatible with Sodium, improves performance over Sodium alone.

A Fabric mod based on Starlight that improves the performance of light updates in Minecraft.

Speed up your world loading by removing spawn chunks.

[NOTE: This mod is now only intended for use with pre-existing Faster Random worlds]

Async particle tick/rendering

Provides DSA & fastest math formulas to game render system for best perfomance! Compatible with Sodium/Embeddium, Iris and shaders.

Optimizes a lot of tasks that Entity AI wastefully performs, minimal effect on gameplay.

Improved achievement performance

Another optimizing mod, provides deduplication, improved memory control, shader/chunk/nbt optimizations and enchanced mob AI. Full compatible with Sodium/Forks, Lithium/Forks, Iris/Forks

A mod that fixes some annoyances and speeds up your game!

Vanilla Worldgen optimization mod

Little optimization bedrock layer

Async is a Fabric mod designed to improve the performance of entities by processing them in parallel threads.

Optimization of the bottom and/or top layer(s) of the world

Item clustering (fallen blocks, experience orbs, ...) and garbage cleanup.

Mainly optimize the game launching time for large pack

Hide extra entities in order to reduce lag, especially with mob farms. The mobs still exist in the world, they are just not visible.

The vertical chunk section syncing mod.

An extremely radical and experimental optimization for Minecraft server performances.

Oxygen is mod for Minecraft that boosts FPS through smart entity and block-entity culling, frustum checks, and density-based rendering. It also adds memory optimizations and handy video options like camera zoom. Lightweight and fast!

Entity LOD Optimizer optimizes Minecraft server performance by dynamically adjusting entity AI based on distance from players