Iris Shaders on Minecraft 26.3 to 1.20.1
Iris Shaders releases started in real Minecraft 26.3, 26.2, 1.21.11, 1.21.1 and 1.20.1 games in the Modkeel lab. It ran in the same game as 6 other mods, among them Sodium, ImmediatelyFast, Mod Menu and LambDynamicLights - Dynamic Lights.
Lab data as of October 4, 2026. Mod id iris.
Minecraft versions
What the lab measured
Frame rate with Iris Shaders, against the same game without mods.
On Minecraft 26.3, Iris Shaders, which runs on Sodium and had no shader pack loaded, raised the frame rate 61% with 300 mobs in view (92 to 148 FPS), 15% over terrain (242 to 278 FPS) and 78% with 300 mobs behind a wall (145 to 258 FPS).
On Minecraft 26.2, Iris Shaders, which runs on Sodium and had no shader pack loaded, raised the frame rate 67% with 300 mobs in view (109 to 182 FPS), 31% over terrain (282 to 370 FPS) and 95% with 300 mobs behind a wall (90 to 176 FPS).
How it was measured: a real Fabric client on a laptop with a GeForce GTX 1650 and a Core i7-10750H joined the same world at 1280x720, render distance 24, VSync off. Each number is the median second of 20-second scenes over 1 to 6 runs. Runs without mods differed by up to 22%, so smaller changes are not counted.
Mods it ran with
| Mod | 26.3 | 26.2 | 1.21.11 | 1.21.1 | 1.20.1 |
|---|---|---|---|---|---|
| Sodium | Bench | Bench | World | World | World |
| ImmediatelyFast | – | – | World | World | World |
| Mod Menu | – | – | World | World | World |
| LambDynamicLights - Dynamic Lights | – | – | World | World | World |
| More Culling | – | – | World | World | World |
| Sodium Extra | – | – | World | World | World |
World: loaded a world together on a client. Server: started a server together. Bench: ran together in a benchmark. Clash: did not run together. A dash: not tested together yet, which is not a conflict.
Get Iris Shaders
Iris Shaders is made by its authors: get it from Iris Shaders on Modrinth, for your exact Minecraft version and loader. Modkeel does not make or host it.
Adding Iris Shaders to your pack?
The lab shows how Iris Shaders did in its own games; your pack is its own mix. The Modkeel Companion, a free mod for Fabric, NeoForge and Forge, copies each world before it loads with different mods; if the game then crashes, it names the mod that most likely caused it and turns that mod off, or goes back to the mods that last worked, in one click.
Crashed already? Paste the crash report to see which mod caused it.
Questions
How much FPS does Iris Shaders add on Minecraft 26.3?
In the Modkeel lab (data as of October 4, 2026), on a laptop with a GeForce GTX 1650 and a Core i7-10750H, on Minecraft 26.3, Iris Shaders, which runs on Sodium and had no shader pack loaded, raised the frame rate 61% with 300 mobs in view (92 to 148 FPS), 15% over terrain (242 to 278 FPS) and 78% with 300 mobs behind a wall (145 to 258 FPS).
Does Iris Shaders work on Minecraft 26.3?
In the Modkeel lab (data as of October 4, 2026), Iris Shaders 1.11.7+26.3-fabric ran in a client benchmark on Minecraft 26.3.
Does Iris Shaders work on Minecraft 26.2?
In the Modkeel lab (data as of October 4, 2026), Iris Shaders 1.11.4+26.2-fabric ran in a client benchmark on Minecraft 26.2.
Does Iris Shaders work on Minecraft 1.21.11?
In the Modkeel lab (data as of October 4, 2026), Iris Shaders 1.10.8+1.21.11-fabric loaded a world on a client on Minecraft 1.21.11.
Does Iris Shaders work on Minecraft 1.21.1?
In the Modkeel lab (data as of October 4, 2026), Iris Shaders 1.8.14-beta.1+1.21.1-fabric loaded a world on a client on Minecraft 1.21.1.
Does Iris Shaders work on Minecraft 1.20.1?
In the Modkeel lab (data as of October 4, 2026), Iris Shaders 1.7.6+1.20.1 loaded a world on a client on Minecraft 1.20.1.
Does Iris Shaders work with ImmediatelyFast?
In the Modkeel lab, Iris Shaders and ImmediatelyFast loaded a world together on a client on Minecraft 1.21.11, 1.21.1 and 1.20.1.
Does Iris Shaders work with LambDynamicLights - Dynamic Lights?
In the Modkeel lab, Iris Shaders and LambDynamicLights - Dynamic Lights loaded a world together on a client on Minecraft 1.21.11, 1.21.1 and 1.20.1.
Does Iris Shaders work with Mod Menu?
In the Modkeel lab, Iris Shaders and Mod Menu loaded a world together on a client on Minecraft 1.21.11, 1.21.1 and 1.20.1.
Does Iris Shaders work with More Culling?
In the Modkeel lab, Iris Shaders and More Culling loaded a world together on a client on Minecraft 1.21.11, 1.21.1 and 1.20.1.
Does Iris Shaders work with Sodium?
In the Modkeel lab, Iris Shaders and Sodium ran together in a client benchmark on Minecraft 26.3 and 26.2; and loaded a world together on a client on Minecraft 1.21.11, 1.21.1 and 1.20.1.
Does Iris Shaders work with Sodium Extra?
In the Modkeel lab, Iris Shaders and Sodium Extra loaded a world together on a client on Minecraft 1.21.11, 1.21.1 and 1.20.1.
What if my game crashes after adding Iris Shaders?
Look at the crash report: it usually names the mod. The Modkeel Companion, a free mod for Fabric, NeoForge and Forge, copies each world before it loads with different mods; if the game then crashes, it names the mod that most likely caused it and turns that mod off, or goes back to the mods that last worked, in one click.
About this data
Loaded a world: a real Minecraft client started with the mod and joined a world. Server started: a real server finished starting with it. Benchmark: it ran through a timed lab scene. Did not start: the game stopped before it was playable.
Each row is one run in the Modkeel lab, matched to the exact file that ran: other files may behave differently. A mod or pair missing here was not tested yet; that is not a conflict. Lab data is CC BY 4.0: attribute "Modkeel lab data (modkeel.com)". Ask the same from an AI assistant with Modkeel's MCP server, or let the Modkeel mod check your own game.