modpacks.ch by CreeperHost No ads. Just mods.
Back to mods
[IWT] | Immersive Weathering: Tweaks project artwork

CurseForge · Minecraft mod

[IWT] | Immersive Weathering: Tweaks

A high performance addon for Immersive Weathering, built to speed up weathering and growth checks, reduce memory usage, and keep your game smoother without changing gameplay behavior ;]

Choose a version Pick your version below, then grab the matching file.

Quick answer

Which [IWT] | Immersive Weathering: Tweaks release should I use?

Updated 26 days ago
Latest stable file immersive-weathering-tweaks-1.3.1.jar
Game version 1.20.1, 1.21.1
Loader Fabric, Forge, NeoForge

[IWT] | Immersive Weathering: Tweaks immersive-weathering-tweaks-1.3.1.jar targets 1.20.1, 1.21.1 with Fabric, Forge, NeoForge. The project page does not say whether this file belongs on the client, dedicated server, or both. All 3 required mods have matching files.

Where it goes

Is [IWT] | Immersive Weathering: Tweaks required on the client, server, or both?

The project page does not say whether this file belongs on the client, dedicated server, or both.

Client Source doesn’t say
Dedicated server Source doesn’t say
Loader for this release Fabric, Forge, NeoForge
Required install it here Optional supported, not mandatory Not supported do not install here Source doesn’t say do not assume

The source does not explicitly classify this release as client-only or server-only.

Understand client and server requirements Read the Minecraft installation guide

What else does [IWT] | Immersive Weathering: Tweaks immersive-weathering-tweaks-1.3.1.jar need?

immersive-weathering-tweaks-1.3.1.jar. Change the file and its required mods may change too.

All 3 required mods have matching files

Install Immersive Weathering [FORGE], [QAPI] | Quantified API, Moonlight Lib first. We found matching files for this game-version and loader setup. 1 comes through another mod in the chain.

2 listed on this file 1 pulled in by one of those mods
Immersive Weathering [FORGE] Needed by [IWT] | Immersive Weathering: Tweaks immersive-weathering-tweaks-1.3.1.jar
required
Matching file found Matched file: immersive_weathering-1.20.1-2.0.5-forge.jar
[QAPI] | Quantified API Needed by [IWT] | Immersive Weathering: Tweaks immersive-weathering-tweaks-1.3.1.jar
required
Matching file found Matched file: quantified api-omni-2.2.4.jar
Moonlight Lib Needed by Immersive Weathering [FORGE]
pulled in
Matching file found Matched file: moonlight-1.20-2.16.37-forge

1 extra mod was pulled in by another dependency. Indented rows show who needs each one. We only count dependency files that match this setup. A file for another loader does not fill the gap.

Before you install it

Add [IWT] | Immersive Weathering: Tweaks without breaking your instance.

Built for [IWT] | Immersive Weathering: Tweaks immersive-weathering-tweaks-1.3.1.jar. Pick another file and the loader, install side or required mods may change.

  1. 01

    Stick to this file

    Use immersive-weathering-tweaks-1.3.1.jar. It targets 1.20.1, 1.21.1 with Fabric, Forge, NeoForge; another release may have different loader, side or dependency requirements.

  2. 02

    Bring the mods it needs

    Install Immersive Weathering [FORGE], [QAPI] | Quantified API, Moonlight Lib first. We found matching files for this game-version and loader setup. 1 comes through another mod in the chain.

  3. 03

    Put it on the correct side

    The project page does not say whether this file belongs on the client, dedicated server, or both.

  4. 04

    Pick the file you checked

    Use the “Get this file” button beside immersive-weathering-tweaks-1.3.1.jar. It opens that exact file at the source.

About this project

What does [IWT] | Immersive Weathering: Tweaks add?

《▓ Immersive Weathering: Tweaks ▓》

Powered by Quantified API

《▒ What It Does ▒》

Immersive Weathering: Tweaks is a lightweight performance addon that makes Immersive Weathering's area checks, growth processing, and weathering logic a LOT less heavy.

Normally, Immersive Weathering creates a ton of temporary position lists and objects while checking nearby blocks. IWT replaces most of that with reusable packed templates and per-thread scratch buffers.

This substantially reduces memory usage and GC pressure in the affected systems, while also making the actual checks faster.

Quantified API safely prepares the known templates in the background during startup, while the main performance improvement comes from reusing those templates during gameplay.

Same checks, same order, same results. Just faster, lighter, and a lot less wasteful. Simple as that xd

Support BlackRift Studios

《▒ Performance ▒》

Metric Normal IW With IWT Gain
Largest area check 19.736 µs 10.036 µs 1.97x faster
Memory allocated per check 15,920 B 24.46 B -99.85%
10,000 area checks 159.2 MB 0.2446 MB -99.85%
Mean MSPT 90.949 86.252 -5.16%
P95 MSPT 117.509 107.184 -8.79%
TPS under load 10.991 11.504 +4.67%

MSPT and TPS results come from paired 180-second Forge stress tests and are directional whole-server results. Exact gains will ofc depend on your hardware, modpack, and how much chaos is happening around the player xd

《▒ Tiny Memory Cost ▒》

IWT keeps around 15.7 KB of shared template data and roughly 4.55 KB of scratch memory per active thread.

So yh, it keeps a few kilobytes around to avoid creating hundreds of megabytes of temporary garbage. Java's GC can finally breathe a little :DDD

《▒ Compatibility ▒》

Minecraft 1.20.1:
• Forge + Fabric
• Immersive Weathering 2.0.5
• Both loaders are shipped together through the same OmniJar.

Minecraft 1.21.1:
• Fabric + NeoForge
• Supports Immersive Weather Renewed.

Requires: Quantified API V2.

《▒ Licensing ▒》

Licensed under BRSSLA, free for personal and non-commercial use.

Found a bug, got an idea, or somehow managed to break it? Feel free to report it :]

Developed and Maintained by Admany - BlackRift Studios 2026

Project description from CurseForge.

Pick your setup

[IWT] | Immersive Weathering: Tweaks by Minecraft version and loader

Choose the version and loader you play, then open the matching release.

6 available setups

Check the dependencies, then try the file in a copied instance before changing a world you care about.

Recent files

[IWT] | Immersive Weathering: Tweaks versions and loaders

6 of 6 releases match

Looking for an older file? The official CurseForge project page is in Resources.

Keep browsing

See more mods

Like this one? One of these might be worth a look.