QuantumMobStacker
by cherMew
QuantumMobStacker merges identical mobs that stand close together into a single stack, which reduces the number of entities the server has to tick.
What it does
Mobs of the same kind that stand within 8.0 blocks of each other are joined automatically, so a crowd that would normally be many separate entities runs as a handful of stacks. The stack count is stored as a Long, so a stack can grow far beyond what a normal integer would allow without overflowing. According to the author, the goal is less CPU and RAM overhead on servers with large mob counts.
The mod is installed on Fabric only, with 26.1.2 and 26.2 as the game versions it covers. It needs both the server and every player to run it, since the environment is client and server. Files for 26.2 are the latest, with version 1.0.2 dated 2026-06-17. The code is available under the MIT License, and the project is not open source.
Key features
Automatic stacking
Nearby mobs of one type fuse into a single stack once they fall inside an 8.0 block radius, and no command or configuration is involved.
Large stack counts
Stack sizes are kept in a Long value, so counts are not capped at the range of a standard integer.
Per-unit death handling
When a stack takes fatal damage, only one mob is removed from the count, and the rest of the group survives.
Loot and experience per mob
Each death drops the loot and experience of one mob, so players collect the same rewards as they would from separate mobs.
Individual death animations
Every mob in a stack plays its own death animation, which keeps the visual result close to unstacked play.
Gallery
Compatibility
Latest build for each game version and loader.
Only full game releases are shown. This mod publishes no snapshot builds.
Use cases
Busy servers
Server owners running farms or crowded areas can reduce entity ticking when many mobs gather in one place.
Who it’s for: Server owners and players who run large mob farms or dense mob areas on Fabric for 26.1.2 or 26.2. Single-player worlds with few mobs gain little from the stacking.
Questions
Does QuantumMobStacker need to be installed on the server?
Which loader does QuantumMobStacker support?
Which game versions are covered?
More from cherMew
What the author says
♾️ QuantumMobStacker QuantumMobStacker is a high-performance optimization mod designed to eliminate entity-related lag in Minecraft. By merging identical mobs within a specific radius into a single "Quantum Stack," this mod significantly reduces CPU and RAM overhead, ensuring a smooth gameplay experience even with…
Official listing
- Modrinth page
- modrinth.com/mod/quantummobstacker
- Owner
- cherMew
- Published
- 2026-05-02
- Updated on Modrinth
- 2026-06-17
- Facts verified
- 2026-10-15