HU: Harium
by JustHari01
Harium rewrites slow vanilla code for AI, redstone, entities, hoppers and physics so that the game runs faster while producing the same results.
What it does
Its AI and pathfinding changes make block type lookups faster and optimize point-of-interest searches, while removing behaviors that do no useful work. Entity processing uses section-based movement tracking and optimized collision detection, and item merging is smarter.
Redstone wire power calculations are optimized, and block entities for inactive tiles go to sleep. Hoppers only scan their inventories when those inventories actually change, instead of checking on every tick. Block sections notify listeners of changes rather than being polled each tick.
The mod builds on Lithium, the optimization project by jellysquid3, and the code is open source under the GNU Lesser General Public License v3.0 only. Either side can run it, and neither needs it. Each optimization category can be turned on or off individually, and the mod is published for Forge on 1.20.1, with version 2.0 as the latest file from 2026-08-20.
Key features
Faster AI lookups
Block type lookups and point-of-interest searches run faster, and behaviors that do nothing useful are removed.
Entity movement and collision
Entities are tracked by section for movement, collision detection is optimized, and item merging is smarter.
Redstone and idle block entities
Redstone wire power calculations are optimized, and block entities on inactive tiles stop ticking until needed.
Event-driven hoppers
Hopper logic is driven by inventory changes and caches results, so hoppers do not scan on every tick.
Fewer allocations
Unneeded object creation in frequently run code is removed, using FastUtil collections in place of standard Java ones.
Specialized voxel shapes
Shape implementations are specialized for faster collision detection and ray tracing.
Compatibility
Latest build for each game version and loader.
Only full game releases are shown. This mod publishes no snapshot builds.
Use cases
Who it’s for: Players and server owners who want the same vanilla behavior with less CPU work on Forge 1.20.1.
Questions
Does Harium change how the game plays?
Does a server need Harium for players to join?
Can individual optimizations be turned off?
Which Minecraft version does Harium support?
In the catalog
HU: Harium is one of 3,545 Optimization mods on ModsFinder, and one of 1,441 Optimization mods for Forge. 34,764 mods support Minecraft 1.20.1.
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What the author says
Harium is a general-purpose optimization mod (based on Lithium) that rewrites inefficient vanilla code with faster, smarter implementations — without changing game behavior. Harium targets the most CPU-intensive systems in Minecraft: entity processing, redstone, AI, hoppers, and physics — replacing slow algorithms…
Official listing
- Modrinth page
- modrinth.com/mod/harium
- Owner
- JustHari01
- Published
- 2026-05-04
- Updated on Modrinth
- 2026-08-20
- Facts verified
- 2026-10-15