It Shall Not Tick (ISNT)

ISNT is a Forge performance mod that reduces the processing cost of ticking entities. Entities within a configurable range of a player tick normally, while entities outside that range tick less often, so the server spends less time on them. Entities that are rendered on the client are still handled as expected, and the server keeps ticking entities a player is interacting with.

The mod integrates with FTB Chunks: entities in claimed chunks keep ticking normally, so claimed areas do not slow down. Specific entities can be added to an ignore list, and the default config already ignores entities such as the minecraft:ender dragon and minecraft:elder guardian. The config file includes comments, and an example modpack configuration is included.

ISNT runs on client and server, so both the server and every player need it. It is published for Forge only, for 1.18.2 and 1.19.2, with 1.0.11-build.35 for 1.19.2 as the latest file. The code is open source under the MIT License.