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FerriteCore Mod Wiki & Guide

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FerriteCore Mod reduces the memory usage of Minecraft in a few different ways. The amount of memory saved will depend on the pack. It reduces the RAM usage (heap size) from 1,792 MB to 984 MB. For comparison, the same setup with Hydrogen instead of FerriteCore uses 1,335 MB.

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Contents (4)
  1. Guides
  2. Frequently asked questions
  3. Gallery
  4. You May Also Like

Guides

Step-by-step, in-game.

Fixing Crashes and Conflicts Caused by FerriteCoreFerriteCore works by deduplicating and compacting how Minecraft stores blockstate, model, and multipart data in…Getting the Most Memory Savings From FerriteCore in a Large ModpackFerriteCore's benefit is proportional to how much duplicate data your pack loads. A vanilla client barely notices it;…How to Install FerriteCore and Confirm It Is Actually Reducing MemoryFerriteCore is a client-side and server-side optimization mod, so you can add it to a singleplayer instance or a…Using FerriteCore on a Server and With Other PlayersFerriteCore is not client-only. It runs on the server too, where it reduces the memory footprint of blockstate and…

Frequently asked questions

What does FerriteCore actually do to my game?
It reduces the amount of RAM Minecraft uses by changing how block states, models, and other repeated data are stored in memory. You don't interact with it directly; it works in the background as soon as the game loads.
How do I know FerriteCore is working?
Open the mod list or the debug screen and confirm FerriteCore is loaded, then compare your allocated heap usage before and after adding it. The clearest sign is a lower memory footprint on the same modpack with no other changes.
Do I need to configure FerriteCore after installing it?
No, it works out of the box with sensible defaults. There is a config file if you want to toggle specific memory-saving features, but most players never need to touch it.
Why is my RAM usage still high even with FerriteCore?
FerriteCore reduces memory used by block states and models, not by textures, entities, or chunks. If your pack is heavy on those, you'll still see high usage and may need other performance mods alongside it.

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