FerriteCore

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Score6.8

Rank#4 of 13

PriceFree

Free planYes

Runs onSelf-hosted

Summary

FerriteCore is a free coremod for Minecraft: Java Edition that aims to reduce RAM use by optimizing memory associated with block states, models, predicates, strings, voxel shapes and baked quads. It supports Fabric, Forge, NeoForge and Quilt, and is listed for Minecraft versions 1.16.5 through 26.3 depending on loader builds. The project is marked for both client and server environments, and its maintainer recommends installing it on both because some optimizations apply server-side. Documented techniques include more compact block-state neighbor storage, caching multipart model predicates, deduplicating model instances and reducing baked-quad memory. In cited examples, individual changes saved hundreds of megabytes; a pack example showed memory after garbage collection dropping from roughly 3.1 GB to 1.1–1.2 GB on the title screen. Several optimizations have no CPU impact during play, though some add load-time CPU cost. ThreadingDetector optimization is disabled by default because it may rarely cause race conditions. FerriteCore uses the MIT license, and its project links to GitHub for source code and issue reporting.

Who it is for

It suits Minecraft: Java Edition players and server operators looking to reduce memory use, provided their game and loader build are supported. The maintainer recommends installing it on both client and server.

What is good

Targets memory used by blocks, models and shapes.
Supports four mod loaders.
Listed for client-side and server-side use.
MIT-licensed and free.
Several optimizations have no CPU impact during play.

What to know first

Some optimizations add load-time CPU cost.
ThreadingDetector optimization is disabled due to rare race conditions.
Not backported to Minecraft versions before 1.16.
Incompatible with Hydrogen on Fabric for Minecraft 1.18 and newer.

Verdict

FerriteCore focuses specifically on reducing Minecraft memory use, with documented examples of substantial savings. Check loader and game-version compatibility, and note that some optimizations may add load-time CPU cost.

FerriteCore plans and pricing

All plans

FerriteCore open-source mod Free MIT License · Minecraft Java Edition mod modrinth.com · 1 Oct 2026

Compared on Minecraft performance mods

Free plan: Yesgithub.com
Mod loader: multi-loadergithub.com
Performance focus: memorygithub.com
Client/server scope: bothgithub.com
Requires Sodium: Nogithub.com

Facts

Purpose: FerriteCore is a coremod designed to reduce Minecraft RAM usage.github.com · 1 Oct 2026
Optimization focus: The mod optimizes memory used by block states, models, predicates, strings, voxel shapes and baked quads.github.com · 1 Oct 2026
Blockstate neighbors: Replacing per-state neighbor tables with FastMaps saves around 600 MB in the documented test.github.com · 1 Oct 2026
Property storage: Replacing ImmutableMap blockstate property storage saves around 170 MB in the documented test.github.com · 1 Oct 2026
Model predicates: Caching multipart model predicates saves 300–400 MB in the documented test.github.com · 1 Oct 2026
Model instances: Deduplicating multipart model instances reduces about 200,000 instances to about 1,500 and saves close to 200 MB.github.com · 1 Oct 2026
Supported game: Modrinth lists compatibility with Minecraft: Java Edition versions from 1.16.5 through 26.3.modrinth.com · 1 Oct 2026
Mod loaders: Supported platforms listed are Fabric, Forge, NeoForge and Quilt.modrinth.com · 1 Oct 2026
Runtime environments: The project is listed as supported on both client-side and server-side environments.modrinth.com · 1 Oct 2026
License: FerriteCore is licensed under the MIT license.modrinth.com · 1 Oct 2026
Support: The project links to GitHub for reporting issues and viewing source code.modrinth.com · 1 Oct 2026
ThreadingDetector: The ThreadingDetector optimization is disabled by default because it may cause very rare race conditions.github.com · 1 Oct 2026
Quad deduplication: Quad deduplication reduces baked-quad memory by close to 150 MB in the documented test.github.com · 1 Oct 2026
Memory reduction: In the 1.16.4 Direwolf20 pack example, memory after garbage collection fell from roughly 3.1 GB to 1.1–1.2 GB on the title screen.curseforge.com · 1 Oct 2026
Fabric benchmark: In All Of Fabric 3 version 2.5.9, heap usage fell from 1,792 MB to 984 MB after generating a world and waiting two minutes.curseforge.com · 1 Oct 2026
Block-state savings: Replacing vanilla block-state neighbor tables with FastMaps is documented as saving around 600 MB in the cited test.github.com · 1 Oct 2026
Model savings: Caching multipart model predicates is documented as saving 300–400 MB in the cited test.github.com · 1 Oct 2026
Runtime behavior: Several documented optimizations have zero CPU impact while playing, with some load-time CPU cost.github.com · 1 Oct 2026
Supported loaders: The project is listed for Fabric, Forge, NeoForge, and Quilt.modrinth.com · 1 Oct 2026
Supported environments: The project is marked as supporting both client-side and server-side environments.modrinth.com · 1 Oct 2026
Installation guidance: The maintainer recommends installing FerriteCore on both client and server because some high-impact optimizations apply to the server.curseforge.com · 1 Oct 2026
Compatibility: The listed Minecraft Java Edition compatibility includes versions from 1.16.5 through 26.3, depending on loader builds.modrinth.com · 1 Oct 2026
Known incompatibility: The Fabric page says FerriteCore builds for Minecraft 1.18 and newer are incompatible with Hydrogen because Hydrogen is archived and receives no releases for those versions.curseforge.com · 1 Oct 2026
Version limit: The maintainer says FerriteCore will not be backported to Minecraft versions before 1.16.curseforge.com · 1 Oct 2026