What is FerriteCore?
FerriteCore by malte0811 (of Immersive Engineering) attacks Minecraft's memory bloat at its roots: duplicated blockstate property maps, redundant model data, and other structures the game allocates by the million. In large modpacks it routinely cuts RAM usage by 30 to 50 percent — measured in whole gigabytes.
There is nothing to configure and no gameplay impact, and with versions on Fabric, Forge, and NeoForge it appears in effectively every modpack built since 2021.
Why Memory Matters
Lower memory pressure produces second-order performance wins:
- Fewer, shorter GC pauses: garbage-collection stutter shrinks when the heap holds less long-lived data.
- Smaller allocations let you run packs comfortably at 4–6 GB that previously demanded 8+.
- Faster startup on some versions, since deduplicated structures build quicker.
FerriteCore stacks cleanly with ModernFix (whose dynamic-resources option targets model memory further) and the rest of the standard performance suite. There is genuinely nothing to configure: install, allocate sensible RAM (6 GB covers most packs), and let the JVM breathe.
FerriteCore FAQ
How much RAM does FerriteCore save?
Depends on pack size: measurements around 30–50% heap reduction are typical for large packs, often multiple gigabytes.
Client or server?
Both. Memory duplication exists on each side; install everywhere.