This mod will no longer be updated. In Minecraft 1.17+ all hopper optimzations are in the optimization mod Lithium. The optimizations are generally even better than before.

Hopper Optimizations Mod

This Mod optimizes hoppers interacting with inventories and item entities. It implements optimizations without changing any observable behavior (besides the better performance). This branch of hopper optimizations requires installing my fork of Lithium.

Performance measurements are welcome. If you find a bug, please report it on the issue tracker. You can support me on patreon

Installation instructions

Install the fabric mod loader. https://fabricmc.net/use/
download both hopperOptimizations and my fork of Lithium
put both hopperOptimizations[...].jar and lithium-fabric-fork-by-2no2name[...].jar into the mods folder.
start the game (no configuration required)

Features

These features are speeding up minecraft hoppers, effectively fixing hopper lag. Besides the lag reduction the behavior is exactly like vanilla.

Inventory Optimizations

Inventories keep extra data such as a modification counter, an item type -> slot mask map, and empty & full slot masks. This allows replacing vanilla's linear search though the whole inventory with a few mask operations to find slots that the hopper can transfer from or to. If the previous transfer attempt failed, and both the hopper and the other inventory haven't increased their modification counter, the hopper can skip the next transfer attempt after mimicking the comparator updates the failed transfer of the naive vanilla implementation sends.

Entity Tracking

Hoppers register their entity search area to a modified version of Lithium's entity tracker engine (available in my fork of Lithium). Now entities notify hoppers about their arrival at hoppers when they move into their interaction area, instead of each hopper searching for entities to interact with in every tick. Only when entities move collisions with the hopper interaction areas need to be calculated.

Cache Inventories

Hoppers keep a reference to inventory blocks (block entities, double chests, or composters) until they are removed or otherwise become invalid. This is faster than looking up the inventory all the time.

Fast Signal Strength

Comparators use extra data from Inventories (item counter) to determine the signal strength of an inventory without accessing all slots.

Cached empty state of Item stacks

Item stacks cache whether they are empty in vanilla, but at the same time the value is recalculated often for no reason. Instead, we always use the cached value.

License

This project uses the MIT license. The Lithium Mod by JellySquid3 and my fork use a different license!