Warning

In 26.1 Minecraft changed how mod developing works. There are no more yarn mappings which are required for this mod. I could try to make a new version but I still think that a lot of people are on 1.21.11 so I won't do it for at least a month while I learn the new offical mappings. I hope you have an understanding for this.

Rhenium

Rhenium is a Fabric performance optimization mod designed to reduce lag in large survival worlds, particularly those with complex redstone contraptions and automated storage systems.

What it optimizes:

Hopper throttling — Idle hoppers that have nothing to move are throttled, significantly reducing tick overhead in large storage systems with many hoppers
Item entity throttling — Stationary ground items tick less frequently, reducing lag in areas with large item piles
Chest render culling — Chest block entity renderers are skipped beyond 24 blocks, reducing client FPS drops in storage rooms with many chests
Particle culling - Changes the distance at which the particles are rendered
Entity culling - Changes the distance in which the entities are rendered

Fully configurable — Every optimization can be toggled individually via Mod Menu, so you keep only what you need.