How to Install FerriteCore and Confirm It Is Actually Reducing Memory

FerriteCore is a client-side and server-side optimization mod, so you can add it to a singleplayer instance or a server without changing world data. The key point is that it does nothing visible in-game — there are no new blocks, items, or commands. Your only feedback is memory usage, so you need to measure before and after.

Install and launch

1. Place the FerriteCore jar in your mods folder alongside the loader it was built for (Fabric, Forge, NeoForge, or Quilt builds exist).

2. Do not mix loader families — a Fabric jar will not load on Forge and vice versa.

3. Launch the game once with your normal modpack so the mod can initialize.

Verify the memory drop

1. Open the debug screen (F3) and note the memory line, or check your launcher's allocated heap versus actual usage.

2. Compare a fresh world load and a short play session against a session without FerriteCore.

3. The savings scale with pack size — a large modpack with many blockstates and models benefits far more than vanilla. If you see no change, confirm the jar is in the right folder and that the loader actually loaded it (check the mod list screen).

FerriteCore is safe to add to existing worlds; it changes how data is stored in memory, not on disk.