FerriteCore

FerriteCore: Memory Optimization on Both Ends

FerriteCore reduces Minecraft's memory footprint by replacing inefficient internal data structures — with no visible gameplay changes at all. With over 124 million downloads, it's a long-standing favorite among utility optimization mods, and it runs on both the client and the server.

For hosting purposes, that's the key takeaway: drop the matching version into your server's mods folder to benefit from the reduced memory usage, which becomes especially noticeable in modpacks that add large numbers of blocks and items. Install the same jar on the client side too, so local instances see the same benefit.

Note: FerriteCore supports Fabric, Forge, NeoForge, and Quilt — just make sure you grab the build that matches your specific loader and Minecraft version.

Plan the rollout and operation

FerriteCore is useful for memory-heavy mod lists but should be judged with real measurements. Start the same world and player count before and after enabling it and compare memory use, boot time, and logs. Test saving, chunk loading, and a full restart. Keep client and server builds aligned with the relevant Minecraft and loader version; do not mix releases merely because their file names look similar.

Before installation, back up the world, mods, config, and defaultconfigs, and record the Minecraft, loader, mod, and dependency versions. Start the complete list on a copy first and read the log for missing or incompatible requirements. A meaningful test covers server boot, joining with a matching client, chunk loading, the core feature, saving, restarting, and joining again. Measure performance mods against the same world and load; validate libraries through at least one dependant feature. Update only one package or one related dependency group per run. Before removal, determine whether blocks, entities, items, or configuration remain in the save. Only a cleanly loading world copy justifies changing the live server. Keep previous files and the backup ready rather than mixing several versions during a boot failure. Finally, record the result with the server log and client version so later updates can be compared against a proven working state.