ImmediatelyFast is an open source Minecraft mod which improves the immediate mode rendering performance of the client.
It is designed to be lightweight and compatible with other mods.
Optimizations
ImmediatelyFast generally optimizes all immediate mode rendering by using a custom buffer implementation which batches
draw calls and uploads data to the GPU in a more efficient way.
The following parts of the immediate mode rendering code are optimized:
- Entities
- Block entities
- Particles
- Text rendering
- GUI/HUD
- Immediate mode rendering of other mods
It also features targeted optimizations where vanilla rendering code is being changed in order to run faster.
The following parts of the rendering code are optimized with a more efficient implementation:
- Map rendering
- HUD rendering
- Text rendering
Performance
Here are some performance comparisons of areas the mod optimizes particularly well:
If other mods are listed in the table this means that this mod also optimizes that part of the game.
Test Hardware: Ryzen 5 1600, 32GB DDR4, GTX 1060
FPS Numbers were taken from external tools (in this case MSI Afterburner) and averaged over a couple of seconds.
If you decide to test this yourself keep in mind that ImmediatelyFast can only improve FPS in a scenario where your CPU
is the bottleneck (Most likely the case if your GPU isn't ancient or you use very heavy shaders).
Slower CPUs will benefit more from this mod than really fast CPUs.
Entity Rendering
Generally FPS should be around 2x higher on busy servers. [Tested using IF 1.1.7 on 1.19.3]
_Tested on a spigot server with 1000 cows in a 3x3 box on screen._
Map Rendering
Generally FPS should be around 5x higher when there are many maps on screen. [Tested using IF 1.1.1 on 1.19.3]
_Tested on a fabric server with the Image2Map mod and around 930 maps on screen._
HUD Rendering
Generally FPS should be around 40% higher in almost all scenarios. [Tested using IF 1.1.7 on 1.19.3]
_Tested on a spigot server with different HUD elements on screen (Scoreboard, Potion effect overlay, Bossbars, Filled Chat, Extra hearts, Full Hotbar)._
Text Rendering
Generally FPS should be around 2x higher when there are many signs or holograms around you. [Tested using IF 1.1.7 on 1.19.3]
_Tested on a spigot server with 200 signs (Filled with text) on screen._
Block-Entity Rendering
Generally FPS should be around 20% higher when there are many block entities around you. [Tested using IF 1.1.7 on 1.19.3]
_Tested on a spigot server with 400 chests on screen._
Compatibility
ImmediatelyFast is structured to interfere with mods as little as possible.
It should work fine with most if not all mods and modpacks.
Known incompatibilities:
- OptiFabric / OptiFine
- Most closed source "clients" like LunarClient and LabyMod
If you encounter any issues, please report them on the Issue Tracker.
Config
ImmediatelyFast has a config file which can be found in the config folder of your Minecraft instance. Most options should be left at their default values, but some may be tweaked to improve performance or compatibility.
font_atlas_resizing: Increases the sizes of the font atlas textures. This improves performance with high resolution or custom server fonts.
map_atlas_generation: Puts the map textures into a single texture instead of multiple textures. This improves performance when many maps are on screen.
hud_batching: Improves the performance of the HUD rendering by submitting less draw calls. If you experience issues with HUD elements, try disabling this optimization.
fast_text_lookup: Caches some data between rendering text characters. This slightly improves performance when rendering a lot of text.
avoid_redundant_framebuffer_switching: This optimization reduces the number of framebuffer switches when rendering many different things in the world (entities, particles, block entities, ...) or the HUD to increase FPS.
experimental_disable_error_checking: Disables OpenGL error checking. This may improve performance on certain systems, but can cause hard to debug issues if enabled.
experimental_disable_resource_pack_conflict_handling: Controls if ImmediatelyFast should scan resource packs for incompatible core shader modifications in oder to disable some conflicting optimizations. This can be disabled to force optimizations even if they may cause graphical issues with certain resource packs.
experimental_sign_text_buffering: Buffers text on signs instead of re-rendering it every frame. May cause issues with high resolution or custom fonts.
experimental_screen_batching: Improves the performance of some in-game screens rendering by submitting less draw calls.
Developer API
You can read the latest version of the API docs here.
Partners
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Credits to sydist for making the logo!
ABOUT THIS LISTING
This page describes ImmediatelyFast by RaphiMC. The description and screenshots are the author's own, imported from their listing on Modrinth on 14 August 2026: https://modrinth.com/mod/immediatelyfast
Mythiq hosts no files for it. The download button goes straight to the release file on cdn.modrinth.com, so you are downloading from the author's own host, not from a copy of ours.
The download count, rating and comments on this page start at zero and count Mythiq only. The source's own figures are not copied here — they measure a different site, and a number that cannot be checked against our own ledger is not worth printing.
Requirements
Game version
26.2
MOD LOADER
This release is built for Neoforge. A mod built for one loader will not load under another — Fabric mods do not run on Forge, and vice versa.
GAME VERSION
Built for Minecraft 26.2. Minecraft mods are tied to an exact version: a 1.21.4 build will refuse to load on 1.21.5.
DEPENDENCIES
Check the author's listing for required libraries before you start the game — a missing dependency shows up as a crash on launch, not as a warning.
Installation
1. Install Neoforge for the Minecraft version you play, if you have not already.
2. Download the .jar with the button on this page. Do not unzip it — a mod jar is installed as it is.
4. Launch the game with the Neoforge profile selected.
ON A SERVER
Anything that changes world generation or gameplay has to be installed on the server as well as on every client. Client-side visual and interface mods do not.
UPDATING
Replace the old .jar rather than adding the new one beside it. Two versions of the same mod in the folder is a crash on launch.
This release downloads from cdn.modrinth.com, not from us, so
there is no checksum to compare against. Scan the archive before you unpack it.
Tell us if something is wrong — a file that will not work, content taken from
someone else, or anything that looks unsafe. Reports go to our review team, not
to the author.
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