Mods tested on Minecraft 1.21.11
Sodium mc1.21.11-0.8.15-beta.1-fabric and Iris Shaders 1.10.8+1.21.11-fabric loaded a world together on a client on Minecraft 1.21.11 in the Modkeel lab. 12 mod releases started in real Minecraft 1.21.11 games in the Modkeel lab, among them Sodium, Iris Shaders, Lithium, FerriteCore and Entity Culling. The Modkeel lab also ran 31 pairs of mods in the same game.
Lab data as of October 4, 2026. 12 releases ran, 31 pairs.
Releases that ran on 1.21.11
| Mod | Release | Result |
|---|---|---|
| Entity Culling | 1.11.2 | Server started |
| FerriteCore | 8.2.0-fabric | Server started |
| ImmediatelyFast | 1.14.3+1.21.11-fabric | Loaded a world |
| Iris Shaders | 1.10.8+1.21.11-fabric | Loaded a world |
| Krypton | 0.2.10 | Server started |
| LambDynamicLights - Dynamic Lights | 4.9.1+1.21.11 | Loaded a world |
| Lithium | mc1.21.11-0.21.4-fabric | Server started |
| Mod Menu | 17.0.1 | Loaded a world |
| More Culling | 1.6.2 | Loaded a world |
| Sodium | mc1.21.11-0.8.15-beta.1-fabric | Loaded a world |
| Sodium Extra | mc1.21.11-0.9.4+fabric | Loaded a world |
| Very Many Players (Fabric) | 0.2.0+beta.7.227+1.21.11 | Server started |
Mods that ran in the same game on 1.21.11
Each mod, and the mods the Modkeel lab ran in the same 1.21.11 game with it.
- Sodium
Iris Shaders, ImmediatelyFast, Mod Menu, LambDynamicLights - Dynamic Lights, More Culling, Sodium Extra
- Iris Shaders
Sodium, ImmediatelyFast, Mod Menu, LambDynamicLights - Dynamic Lights, More Culling, Sodium Extra
- Lithium
FerriteCore, Entity Culling, Krypton, Very Many Players (Fabric)
- FerriteCore
Lithium, Entity Culling, Krypton, Very Many Players (Fabric)
- Entity Culling
- ImmediatelyFast
Sodium, Iris Shaders, Mod Menu, LambDynamicLights - Dynamic Lights, More Culling, Sodium Extra
- Mod Menu
Sodium, Iris Shaders, ImmediatelyFast, LambDynamicLights - Dynamic Lights, More Culling, Sodium Extra
- Krypton
Lithium, FerriteCore, Entity Culling, Very Many Players (Fabric)
- LambDynamicLights - Dynamic Lights
Sodium, Iris Shaders, ImmediatelyFast, Mod Menu, More Culling, Sodium Extra
- More Culling
Sodium, Iris Shaders, ImmediatelyFast, Mod Menu, LambDynamicLights - Dynamic Lights, Sodium Extra
- Sodium Extra
Sodium, Iris Shaders, ImmediatelyFast, Mod Menu, LambDynamicLights - Dynamic Lights, More Culling
- Very Many Players (Fabric)
Updating your pack to 1.21.11?
The lab shows how each release did in its own games; your pack is its own mix. The Modkeel Companion, a free mod for Fabric, 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
Do Sodium and Iris Shaders work together on Minecraft 1.21.11?
Yes: in the Modkeel lab (data as of October 4, 2026), Sodium mc1.21.11-0.8.15-beta.1-fabric and Iris Shaders 1.10.8+1.21.11-fabric loaded a world together on a client on Minecraft 1.21.11.
Does FerriteCore work on Minecraft 1.21.11?
In the Modkeel lab (data as of October 4, 2026), FerriteCore 8.2.0-fabric started a server on Minecraft 1.21.11.
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 Lithium work on Minecraft 1.21.11?
In the Modkeel lab (data as of October 4, 2026), Lithium mc1.21.11-0.21.4-fabric started a server on Minecraft 1.21.11.
Does Sodium work on Minecraft 1.21.11?
In the Modkeel lab (data as of October 4, 2026), Sodium mc1.21.11-0.8.15-beta.1-fabric loaded a world on a client on Minecraft 1.21.11.
Which mods work together on Minecraft 1.21.11?
In the Modkeel lab on Minecraft 1.21.11, these pairs ran in the same game: Entity Culling with FerriteCore; Entity Culling with Krypton; Entity Culling with Lithium; Entity Culling with Very Many Players (Fabric); FerriteCore with Krypton; FerriteCore with Lithium; FerriteCore with Very Many Players (Fabric); ImmediatelyFast with Iris Shaders; ImmediatelyFast with LambDynamicLights - Dynamic Lights; ImmediatelyFast with Mod Menu; ImmediatelyFast with More Culling; ImmediatelyFast with Sodium; ImmediatelyFast with Sodium Extra; Iris Shaders with LambDynamicLights - Dynamic Lights; Iris Shaders with Mod Menu; Iris Shaders with More Culling; Iris Shaders with Sodium; Iris Shaders with Sodium Extra; Krypton with Lithium; Krypton with Very Many Players (Fabric); LambDynamicLights - Dynamic Lights with Mod Menu; LambDynamicLights - Dynamic Lights with More Culling; LambDynamicLights - Dynamic Lights with Sodium; LambDynamicLights - Dynamic Lights with Sodium Extra; Lithium with Very Many Players (Fabric); Mod Menu with More Culling; Mod Menu with Sodium; Mod Menu with Sodium Extra; More Culling with Sodium; More Culling with Sodium Extra; Sodium with Sodium Extra.
How do I update my modpack to Minecraft 1.21.11 without losing my world?
Swap each mod for a release made for 1.21.11: in the Modkeel lab, releases made for an older version often did not start. Keep a copy of the world first. The Modkeel Companion, a free mod for Fabric, 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.