Jmon's Extended Mechanics

This mod adds many vanilla+ features to 1.21.4 (newer versions in the future).

41 Downloads

neoforgeadventuregame-mechanicsworldgen

Rent Server with this Mod

Screenshots

All Blocks, Items, and Entities Added (as of v1.0)

About this Mod

Jmon's Extended Mechanics (JEM)

This mod adds many small features to the game while keeping vanilla minecraft balanced. Inspired by Quark, Cell, and many other Vanilla+ mods, JEM adds more content to every level of vanilla progression, from gravel being craftable using flint, to large, beautiful caverns made of calcite and amethyst. Explore various new biomes, each with their own unique features, blocks, items, and more...

If you want more information on a specific feature in JEM, look at the DOCS (WIP)

To report a bug (by the way, thank you in advance for helping me polish any issues), you can submit a bug report here.

Note: I will be updating this mod regularly (maybe monthly).

Available Versions

Jmon's Extended Mechanics 1.0release

MC 1.21.4neoforge

June 1, 2025

How to Install Jmon's Extended Mechanics on Your Server

Order Server

Order a Minecraft Java server with at least 4 GB RAM (6 GB recommended).

Set neoforge Loader

In the panel under "Egg", select the neoforge loader and matching Minecraft version (1.21.4).

Install Mod

Open the mod browser in the dashboard and search for "Jmon's Extended Mechanics". Click "Install" – done! Alternatively, upload the .jar via SFTP to the /mods folder.

Compatibility

Mod Loaders

neoforge

Minecraft Versions

1.21.4

Server-side

✓ Required

Recommended RAM

6 GB(min. 4 GB)

Frequently Asked Questions

Jmon's Extended Mechanics server crashes on startup – what to do?

Most common cause: wrong neoforge version or insufficient RAM. Check the server log (latest.log) for "OutOfMemoryError" or "Mixin" errors. With Mado Hosting: ensure at least 4 GB RAM is allocated and the loader matches the mod version (1.21.4). You can switch loaders with one click in the panel.

Is Jmon's Extended Mechanics compatible with neoforge?

Jmon's Extended Mechanics officially supports neoforge for Minecraft 1.21.4. The Mado dashboard automatically detects incompatible loader combinations.

Server lagging with Jmon's Extended Mechanics – how to optimize performance?

Recommended RAM: 6 GB (per 5 players). Use /spark profiler to check if Jmon's Extended Mechanics consumes the most tick time. Common fixes: reduce server view-distance to 8-10, install "performant" or "starlight" as supplementary mods on Forge. With Mado Hosting, your server runs on NVMe SSDs with dedicated CPU cores for minimal latency.