Immersive Weathering: Tweaks
Immersive Weathering: Tweaks, or IWT, is a performance addon that reduces the memory and processing cost of Immersive Weathering's area checks and growth work.
What it does
IWT changes how the weathering logic of Immersive Weathering runs. The original mod builds many temporary position lists and objects each time it inspects nearby blocks. IWT swaps most of them for reusable packed templates held in scratch buffers, one per thread, which lowers memory allocation and garbage collection pressure in the affected systems and makes the checks themselves quicker. The intent is that the same checks run in the same order and produce the same outcomes.
The largest gain comes from a startup step in which the Quantified API prepares known templates in the background, so the mod can reuse them during play. IWT keeps a small amount of shared template data and a few kilobytes of scratch memory for each active thread, far less than the hundreds of megabytes of temporary objects it avoids. Exact gains depend on hardware, the modpack and how much activity surrounds the player.
Installation requires Immersive Weathering and Quantified API V2 on Minecraft 1.20.1, and the mod is published for Fabric and Forge. The server and every player need the mod installed. It is released under a custom license and is not open source.
Key features
Reusable packed templates
Most temporary position lists and objects are replaced with packed templates that are reused across checks.
Per-thread scratch buffers
Each active thread works in its own scratch buffer of a few kilobytes, which avoids repeated allocations.
Background template preparation
Known templates are prepared through the Quantified API during startup, before gameplay needs them.
Lower allocation cost
In the author's stress tests, memory allocated per area check fell by about 99.85 percent, and the largest area check ran nearly twice as fast.
Compatibility
Latest build for each game version and loader.
Only full game releases are shown. This mod publishes no snapshot builds.
How it compares
IWTweaks is a server-required, client-optional mod under the CC0 1.0 Universal license, published for 1.20.1 on Fabric, Forge and NeoForge, and it is not open source. Immersive Weathering + Farmer's Delight: Bark Stripping is server-required, client-optional under the MIT License, covers 1.20 – 1.20.1 on Fabric, Forge and NeoForge, and is not open source. Dynamic Trees - Soils Compat - Immersive Weathering/Grounded is open source under the MIT License, runs on client and server, and targets Forge for 1.18.2 – 1.20.1.
| Mod | Loaders | Game versions | Environment | Updated |
|---|---|---|---|---|
| Immersive Weathering: Tweaks | Fabric and Forge | 1.20.1 – 1.20.6 | Client and server | 2026-07-21 |
| IWTweaks | Fabric, Forge and NeoForge | 1.20.1 | Server required, client optional | 2025-03-10 |
| Immersive Weathering + Farmer's Delight: Bark Stripping | Fabric, Forge and NeoForge | 1.20 – 1.20.1 | Server required, client optional | 2025-06-14 |
| Dynamic Trees - Soils Compat - Immersive Weathering/Grounded | Forge | 1.18.2 – 1.20.1 | Client and server | 2026-03-11 |
Questions
Does Immersive Weathering: Tweaks require Immersive Weathering?
Does the server need Immersive Weathering: Tweaks?
Does IWT change gameplay?
More from BlackRift Studios
What the author says
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…
Official listing
- Modrinth page
- modrinth.com/mod/iwt
- Owner
- BlackRift Studios
- Published
- 2026-07-13
- Updated on Modrinth
- 2026-07-21
- Facts verified
- 2026-10-15