The 1.21.5 Backport

1.21.5 features for 1.20.1!

4.5K Downloads

forgedecorationworldgen

Rent Server with this Mod

Screenshots

Me finding a 4 block tall sugar cane while in the mod

About this Mod

This mod is really, really simple. its adds wildflowers, leaf litter, bushes, short dry grass, tall dry grass, and a panorama.

❓questions❓

Q: why did i do this?

A: i wanted to, there was no 1.21.5 backports.

Q: why haven't i posted mods in a while?

A: i just released it: https://modrinth.com/mod/ambienceimproved

ENJOY (:

Available Versions

The 1.21.5 Backport 1.0.1release

MC 1.20.1forge

March 23, 2025

The 1.21.5 Backport 1.0.0release

MC 1.20.1forge

March 9, 2025

How to Install The 1.21.5 Backport on Your Server

Order Server

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

Set forge Loader

In the panel under "Egg", select the forge loader and matching Minecraft version (1.20.1).

Install Mod

Open the mod browser in the dashboard and search for "The 1.21.5 Backport". Click "Install" – done! Alternatively, upload the .jar via SFTP to the /mods folder.

Compatibility

Mod Loaders

forge

Minecraft Versions

1.20.1

Server-side

✓ Required

Recommended RAM

6 GB(min. 4 GB)

Frequently Asked Questions

The 1.21.5 Backport server crashes on startup – what to do?

Most common cause: wrong forge 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 (1.20.1). You can switch loaders with one click in the panel.

Is The 1.21.5 Backport compatible with forge?

The 1.21.5 Backport officially supports forge for Minecraft 1.20.1. The Mado dashboard automatically detects incompatible loader combinations.

Server lagging with The 1.21.5 Backport – how to optimize performance?

Recommended RAM: 6 GB (per 5 players). Use /spark profiler to check if The 1.21.5 Backport 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.