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ImmediatelyFast
What it is
ImmediatelyFast is a free, open-source mod for Minecraft: Java Edition that targets client-side rendering performance. It batches draw calls with a custom buffer and sends data to the GPU more efficiently. Its optimizations cover entities, block entities, particles, text, GUI and HUD elements, maps, and immediate mode rendering used by other mods. The project supports Fabric, Forge, NeoForge, and Quilt, with compatibility listed for Minecraft 1.18.2 through 1.21.x and versions 26.1.x, 26.2, and 26.3. The maker describes it as lightweight and intended to work with most mods and modpacks, but names OptiFabric, OptiFine, LunarClient, and LabyMod as incompatibilities. Performance gains depend on the system: the mod can improve FPS when the CPU is the bottleneck, and slower CPUs may benefit more than very fast ones. Configuration options are available in a file in the Minecraft instance’s config folder. The project provides developer API documentation and is licensed under LGPL-3.0-or-later.
For and against
For
- Free and open source under LGPL-3.0-or-later.
- Supports Fabric, Forge, NeoForge, and Quilt.
- Optimizes several rendering areas, including maps and particles.
- Configuration file offers performance and compatibility options.
Against
- Known incompatibilities include OptiFine and LunarClient.
- FPS improvement depends on a CPU bottleneck.
- No dedicated server support.
The verdict
ImmediatelyFast focuses specifically on client-side rendering and supports several mod loaders. Check its named incompatibilities and consider that the maker says slower CPUs are more likely to benefit.
Who it suits
It suits Minecraft: Java Edition players seeking client-side rendering optimizations, particularly those whose CPU is a performance bottleneck. Developers can also consult its API documentation.
Plans and prices
ImmediatelyFast
Open source Minecraft client mod · LGPL-3.0-or-later
Read 7 Oct 2026 · github.com
On the record
- API main class
- The documented main class is net.raphimc.immediatelyfast.ImmediatelyFast, which exposes loaded configuration, runtime configuration and mod version.github.com · read 15 Oct 2026
- Areas optimized
- It optimizes rendering for entities, block entities, particles, text, GUI/HUD, maps, and immediate mode rendering by other mods.github.com · read 7 Oct 2026
- Block-entity rendering
- Block-entity rendering receives targeted optimization.github.com · read 15 Oct 2026
- Client-only
- Modrinth marks the supported environment as client-side.modrinth.com · read 15 Oct 2026
- Client-side
- The project listing identifies the supported environment as client-side Minecraft: Java Edition.modrinth.com · read 7 Oct 2026
- Compatibility
- The project is designed to interfere minimally with other mods and modpacks.github.com · read 15 Oct 2026
- Configuration
- Configuration is stored in the Minecraft instance config folder and includes atlas, batching, text lookup and framebuffer options.github.com · read 15 Oct 2026
- CurseForge reach
- CurseForge shows 190,454,848 downloads for the project.curseforge.com · read 15 Oct 2026
- Developer API
- The API documentation shows Gradle installation through the Modrinth Maven repository.github.com · read 15 Oct 2026
- Distribution compatibility
- Modrinth lists Minecraft Java Edition 1.18.2 through 26.3 and Fabric, Forge, NeoForge and Quilt loaders.modrinth.com · read 15 Oct 2026
- Documentation depth
- The dedicated API document is only 16 lines and provides dependency coordinates plus the main class.github.com · read 15 Oct 2026
- Entity rendering
- Entity rendering is one of the optimized areas.github.com · read 15 Oct 2026
- Experimental settings
- Experimental error-checking, resource-pack and sign-buffering settings can cause difficult debugging or graphical problems.github.com · read 15 Oct 2026
- GUI and HUD
- GUI and HUD rendering are optimized.github.com · read 15 Oct 2026
- Independent benchmark
- Modkeel measured no change beyond run variance on Minecraft 26.3 and 26.2, but recorded gains on older versions including 42% on 1.21.1 with 300 mobs.modkeel.com · read 15 Oct 2026
- Integration testing
- Modkeel reports successful tests with Sodium, Iris, Entity Culling, Mod Menu, LambDynamicLights, More Culling and Sodium Extra in specified versions.modkeel.com · read 15 Oct 2026
- Known incompatibilities
- The README lists OptiFabric/OptiFine and most closed-source clients such as LunarClient and LabyMod as incompatible.github.com · read 15 Oct 2026
- Licence
- The source is licensed under the GNU Lesser General Public License version 3.github.com · read 15 Oct 2026