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 unneeded chunks.

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

Async particle tick, GPU accelerated particle rendering.

A Level of Detail rendering mod

Vanilla Worldgen optimization mod

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

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

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 client-side optimization mod to make block entities render faster

Async improves entity performance by processing entities in parallel across multiple CPU cores and threads.

Faster texture animation

Little optimization bedrock layer

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

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

Mainly optimize the game launching time for large pack

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

The vertical chunk section syncing mod.

Better performance for low-end PCs, potato PCs, and on mobile. Possibly also on some mid- or high-end PCs

An extremely radical and experimental optimization for Minecraft server performances.

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