ImmediatelyFast on Minecraft 26.2 to 1.20.1
ImmediatelyFast releases started in real Minecraft 26.2, 1.21.11, 1.21.1 and 1.20.1 games in the Modkeel lab. It ran in the same game as 7 other mods, among them Sodium, Iris Shaders, Entity Culling and Mod Menu.
Lab data as of October 4, 2026. Mod id immediatelyfast.
Minecraft versions
What the lab measured
Frame rate with ImmediatelyFast, against the same game without mods.
On Minecraft 26.2, ImmediatelyFast did not change the frame rate with 300 mobs in view or over terrain by more than runs without mods differed.
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 2 to 6 runs. Runs without mods differed by up to 22%, so smaller changes are not counted.
Mods it ran with
| Mod | 26.2 | 1.21.11 | 1.21.1 | 1.20.1 |
|---|---|---|---|---|
| Sodium | Bench | World | World | World |
| Iris Shaders | – | World | World | World |
| Entity Culling | Bench | – | – | – |
| 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 ImmediatelyFast
ImmediatelyFast is made by its authors: get it from ImmediatelyFast on Modrinth, for your exact Minecraft version and loader. Modkeel does not make or host it.
Adding ImmediatelyFast to your pack?
The lab shows how ImmediatelyFast 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
Does ImmediatelyFast raise FPS on Minecraft 26.2?
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 26.2, ImmediatelyFast did not change the frame rate with 300 mobs in view or over terrain by more than runs without mods differed.
Does ImmediatelyFast work on Minecraft 26.2?
In the Modkeel lab (data as of October 4, 2026), ImmediatelyFast 1.16.5+26.2-fabric ran in a client benchmark on Minecraft 26.2.
Does ImmediatelyFast work on Minecraft 1.21.11?
In the Modkeel lab (data as of October 4, 2026), ImmediatelyFast 1.14.3+1.21.11-fabric loaded a world on a client on Minecraft 1.21.11.
Does ImmediatelyFast work on Minecraft 1.21.1?
In the Modkeel lab (data as of October 4, 2026), ImmediatelyFast 1.6.14+1.21.1-fabric loaded a world on a client on Minecraft 1.21.1.
Does ImmediatelyFast work on Minecraft 1.20.1?
In the Modkeel lab (data as of October 4, 2026), ImmediatelyFast 1.5.5+1.20.4-fabric loaded a world on a client on Minecraft 1.20.1.
Does ImmediatelyFast work with Entity Culling?
In the Modkeel lab, ImmediatelyFast and Entity Culling ran together in a client benchmark on Minecraft 26.2.
Does ImmediatelyFast work with Iris Shaders?
In the Modkeel lab, ImmediatelyFast and Iris Shaders loaded a world together on a client on Minecraft 1.21.11, 1.21.1 and 1.20.1.
Does ImmediatelyFast work with LambDynamicLights - Dynamic Lights?
In the Modkeel lab, ImmediatelyFast and LambDynamicLights - Dynamic Lights loaded a world together on a client on Minecraft 1.21.11, 1.21.1 and 1.20.1.
Does ImmediatelyFast work with Mod Menu?
In the Modkeel lab, ImmediatelyFast and Mod Menu loaded a world together on a client on Minecraft 1.21.11, 1.21.1 and 1.20.1.
Does ImmediatelyFast work with More Culling?
In the Modkeel lab, ImmediatelyFast and More Culling loaded a world together on a client on Minecraft 1.21.11, 1.21.1 and 1.20.1.
Does ImmediatelyFast work with Sodium?
In the Modkeel lab, ImmediatelyFast and Sodium ran together in a client benchmark on Minecraft 26.2; and loaded a world together on a client on Minecraft 1.21.11, 1.21.1 and 1.20.1.
Does ImmediatelyFast work with Sodium Extra?
In the Modkeel lab, ImmediatelyFast 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 ImmediatelyFast?
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.