ImmediatelyFast

Speed up immediate mode rendering in Minecraft

optimization

76.3M downloads

Created Apr 9, 2026

by RaphiMC

About

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

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

HUD Rendering

Generally FPS should be around 40% higher in almost all scenarios.

Tested using IF 1.1.7 on 1.19.3

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

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

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.

Versions

v1.14.2+1.21.11-neoforgeLatest

1.21.11•neoforge•Jan 27, 2026

* Fixed player nametag render order * Fixed core shader incompatibility detection logic bug * Added allocated bytes of Buffer Pool to the debug hud * Added advanced memory leak detector * Fixed batching buffer clearing

v1.14.2+1.21.11-fabric

1.21.11•fabric, quilt•Jan 27, 2026

v1.13.5+1.21.10-neoforge

1.21.9, 1.21.10•neoforge•Jan 27, 2026

Download

Download v1.14.2+1.21.11-neoforge

Minecraft: 1.21.11

Loaders: neoforge

Tags

fabricforgeneoforgequilt1.21.71.21.81.21.91.21.101.21.11