ImmediatelyFast

Overview

ImmediatelyFast is a free, open-source client mod for Minecraft: Java Edition that focuses on rendering efficiency. It suits players whose CPU is limiting frame rates, particularly those using modded clients across different loaders. Its targeted optimizations may help in that situation, but they are not a general performance fix.

By batching draw calls and improving how rendering data is sent to the GPU, it targets the client-side work of drawing the game rather than server performance. The breadth of supported rendering areas is useful in varied modpacks, but known conflicts make compatibility checks essential before adding it to an established setup.

Key features

• CPU-focused rendering: A custom buffer implementation batches draw calls and uploads data to the GPU more efficiently. The project says slower CPUs stand to benefit more; players with very fast CPUs should temper expectations, especially if CPU performance is not their bottleneck.
• Broad rendering coverage: It targets entities, block entities, particles, text, GUI and HUD, maps, and immediate-mode rendering from other mods. That range makes it relevant to more than one type of scene or interface, though it does not make the mod a substitute for unrelated performance optimizations.
• Config options: A file in the Minecraft instance’s config folder offers adjustments for performance or compatibility. That gives users some flexibility when fitting it into a client, but it does not guarantee a workaround for a known incompatibility.
• Loader and version range: The project names Fabric, Forge, NeoForge, and Quilt, and lists Minecraft compatibility from 1.18.2 through 1.21.x, as well as 26.1.x, 26.2, and 26.3. This makes it a practical option across a range of modded clients, provided the player’s particular setup falls within those supported combinations.
• Developer API: API documentation is available for developers. That is useful for mod authors integrating with its rendering work, but is not a separate benefit for players who only want to install the mod.

Pricing

ImmediatelyFast costs free. The free plan is the open-source Minecraft client mod under the LGPL-3.0-or-later license; there is no paid tier to weigh against a cheaper option. It is a straightforward choice for players who want rendering optimization without a software charge, although users still need a compatible client and mod setup.

There is no free trial because the mod itself is free. It does not require Sodium, but it has no dedicated server support, so it is not a server-side performance option. GitHub reports no security policy file and no published security advisories.

Platforms

The supported operating systems are Linux, macOS, and Windows. The project is for client-side Minecraft: Java Edition and supports Fabric, Forge, NeoForge, and Quilt. Its multi-loader reach is a strength for players who do not want to choose a mod solely around one of those loaders, but the listed Minecraft version range still matters.

Compatibility is described as broad across mods and modpacks, with OptiFabric, OptiFine, LunarClient, and LabyMod named as known incompatibilities. Players using any of those should not treat ImmediatelyFast as a safe addition to their current setup. The project directs users to its GitHub issue tracker for problems and also links to a Discord server.

Who it's for

ImmediatelyFast is best suited to Minecraft Java Edition players who want client-side rendering improvements and have a CPU-bound frame rate. Its coverage of common game elements and rendering by other mods makes it worth considering for varied modpacks, especially when its loader and version support match the client.

It is a poor fit for users on one of the named incompatible clients or mods, anyone seeking dedicated server support, and players expecting reliable gains regardless of hardware. The project specifically says very fast CPUs may benefit less, so the likely upside depends on the system’s CPU.

Pros and cons

• Pros: Free and open source. The mod is listed as free and licensed under LGPL-3.0-or-later, with no paid plan to unlock its stated rendering focus.
• Pros: Targets multiple rendering areas. It covers entities, block entities, particles, text, GUI and HUD, maps, and immediate-mode rendering from other mods, which is more broadly useful than a narrowly scoped rendering optimization.
• Pros: Four named loaders. Fabric, Forge, NeoForge, and Quilt support gives players more options when matching a mod to a client.
• Cons: Benefits depend on the CPU. Slower CPUs are expected to benefit more, while very fast CPUs may see less improvement; it is not a dependable FPS boost for every system.
• Cons: Several known incompatibilities. OptiFabric, OptiFine, LunarClient, and LabyMod rule it out for some existing setups.
• Cons: Client-only scope. It does not provide dedicated server support, so server operators seeking performance improvements need another approach.

Alternatives

• Lithium is another free, open-source Minecraft mod for players considering a different mod alongside their client setup.
• VulkanMod is free but requires Fabric and a GPU with Vulkan 1.2 support, so it is the alternative to consider only when that graphics requirement is met.
• Exordium is a free client-side mod, another option for players seeking a client mod rather than a dedicated server tool.
• Nvidium is free and Linux-only, and requires Sodium plus an NVIDIA GPU that supports mesh shaders; it fits only users whose setup meets those requirements.
• FerriteCore is a free, MIT-licensed Minecraft Java Edition mod, an alternative for readers considering a different open-source mod.
• Krypton is a free Minecraft mod under LGPL-3.0-only.
• Alternate Current is a free, MIT-licensed Minecraft mod.
• wWaypoints is another option from creator wSmoothie, who makes Minecraft mods, videos, and tools.

For more options in the same category, browse Minecraft Performance Mods.

Verdict

Choose ImmediatelyFast if you want a free, multi-loader client mod for Minecraft Java Edition and your frame rate is constrained by rendering work on the CPU. Its main advantage is a focused approach that covers many in-game rendering areas without requiring Sodium. Look elsewhere if you use OptiFabric, OptiFine, LunarClient, or LabyMod, need server support, or have a very fast CPU and expect substantial gains regardless of your system.