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.

Async particle tick, GPU accelerated particle rendering.

Vanilla Worldgen optimization mod

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

A Level of Detail rendering 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.

A client-side optimization mod to make block entities render faster

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

Faster texture animation

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

Little optimization bedrock layer

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

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

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. Possibly on mobile, and also on some mid- or high-end PCs

An extremely radical and experimental optimization for Minecraft server performances.

Mix of small optimizations for your Minecraft

Advancements optimization mod, updated fork of Icterine / Cerulean with added features

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