
Faster Iris Shadow Mapper
I don't know my version or loader

⚠️ This has been included in Iris 1.11.2, it is now only useful for older MC versions or for forks like oculus ⚠️
Faster Iris Shadow Mapping is a really lightweight mod that prevents unneeded things from rendering during the shadow pass.
This project does not replace Iris, both needs to be used at the same time for it to work.
This mod also works with oculus.
How it works
During the shadow pass, for opaque models, the color of the model won't have any visual change, a blue car and a red car both cast the same shadow, no matter their color. So what this mod does is it prevents things like the text on signs, the banner patterns, the enchantment glint etc from rendering during the shadow pass. It only improves performances when some of those are visibles.
Performance showcase
Small base in a flat world (26.1.2 - 1.0.0)
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- +10% FPS
A lot of signs and banners (26.1.2 - 1.0.0)
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- +50% FPS on average
- +1000% FPS on 0.05% low
- The signs have text on them but on the other side
Modpacks
Feel free to use this mod in your modpacks without asking for permission.
- Edition: Minecraft Java
- File type: .jar
- Minecraft versions listed: 1.21, 1.21.1
- How to install: Install the matching mod loader (Forge, Fabric or NeoForge) for your Minecraft version. → Download the .jar. → Put it in the .minecraft/mods folder and launch that loader profile.
- Where to get it: Opens on Modrinth — not every file is mirrored on our own servers.
Install steps are the general flow for this file type — How to install Minecraft Java mods & modpacks walks through it step by step.
- Ships as fism+1.21.1-neoforge-1.0.5.jar — drop this file into the mods folder
- Download size: 21 KB
- Download link checked 27 Aug 2026 — working
These come from our own check of the pack file, not from the source page.