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[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 ;]

《▓ 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

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《▒ Performance ▒》

MetricNormal IWWith IWTGain
Largest area check19.736 µs10.036 µs1.97x faster
Memory allocated per check15,920 B24.46 B-99.85%
10,000 area checks159.2 MB0.2446 MB-99.85%
Mean MSPT90.94986.252-5.16%
P95 MSPT117.509107.184-8.79%
TPS under load10.99111.504+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

[IWT] | Immersive Weathering: Tweaks Team

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Founder of BlackRift Studios. Feel free to reach out :]

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