Ferrite

Ferrite

A performance mod for Minecraft 26.3 (Fabric, JDK 25). Java handles integration and mixins; native Rust does the heavy per-tick math where crossing the JNI boundary actually pays. Server-side compatible: install on a server, players don’t need it.

Headline numbers, all measured on real worlds:

• Cramming (default on): ~65% entity-tick reduction at 1000+ packed mobs. Bit-for-bit vanilla push math.
• Redstone (/ferrite redstone ac on): Alternate Current algorithm plus a Rust BFS kernel. A lag machine that held vanilla at 1.4-1.8 TPS recovered to a flat 20.00 TPS. Zero mismatches across 150,000+ oracle checks. Off by default so contraptions tuned to vanilla update order keep working.
• Hoppers (default on): extract loops skip drained slots, up to ~85% cheaper on partially-emptied chests. Opt-in hopper highway multiplies chain throughput ~3x for storage systems.
• Idle sign and furnace tickers suppressed (default on): ~70% block-entity tick reduction at scale, self-healing, mod-subclass safe.
• Pre-gen and predictive chunk forcing (opt-in): 90-118 chunks/s spawn pre-generation with resume, and a generation ring that leads your flight path so you never see terrain loading.

Worldgen math (noise, biomes, density functions) is ported bit-exact and validated every release; parity checks run 63/63 noise and 50/50 density on 26.2.

Every 5 seconds the mod logs where your tick time goes, so optimization targets real bottlenecks. Runtime toggle: /ferrite log monitors off.

Requirements

• Minecraft 26.2 (26.1.2 and 1.21.11 builds available as older releases)
• Java 25, Fabric Loader 0.19.3+, Fabric API 0.154.2+26.2
• Singleplayer and multiplayer

Platforms

Natives bundled for Windows x86_64, Linux x86_64, Linux aarch64 (Not fully tested on a Raspberry Pi 4B), and macOS (universal). If the native fails to load, Ferrite falls back to vanilla behavior automatically: no crashes, no broken worlds.

How to help

Play 10+ minutes with mob farms or crowded worlds, search latest.log for [ferrite], and share the [cramming-dispatch] and [entity-tick] lines in a GitHub issue. Low-end hardware reports are especially useful.

Full measurement tables, methodology, and source: github.com/VoiceLessQ/Ferrite

Credits

• Redstone wire algorithm adapted from Space Walker's Alternate Current (MIT); the design and algorithm remain entirely Space Walker’s.
• JNI scaffolding originally forked from Brayan-724/rust-mod-probe.
• * Linux aarch64 support contributed and tested on real hardware by cwright814.

MIT licensed.