ImmediatelyFast vs Krypton
ImmediatelyFast
github.comKrypton
github.comSide by side
| Figure | ImmediatelyFast | Krypton |
|---|---|---|
| Price from | Free | Free |
| Free plan | Yes | Yes |
| Free trial | — | — |
| Open source | Yes | Yes |
| Windows | Yes | Yes |
| macOS | Yes | Yes |
| Linux | Yes | Yes |
| API | Yes | — |
| Self-hosted | — | Yes |
| Plans published | 1 | 2 |
| Spec score · Minecraft Performance Mods | 8.6 (#1) | 8.5 (#2) |
| Compatibility | The project is designed to interfere minimally with other mods and modpacks. | The FAQ reports compatibility with Fabric API, Lithium, Sodium, Phosphor, and Immersive Portals as specified there. |
| CurseForge reach | CurseForge shows 190,454,848 downloads for the project. | CurseForge reports 36,010,488 downloads and a July 14, 2026 update date on its Krypton listing. |
| Licence | The source is licensed under the GNU Lesser General Public License version 3. | The project is licensed under GNU LGPL version 3, with Modrinth specifying LGPL-3.0-only. |
| License | The project is licensed under LGPL-3.0-or-later. | The project is licensed under LGPL-3.0-only. |
| Minecraft versions | The listing shows compatibility with Minecraft versions 1.18.2 through 1.21.x and versions 26.1.x, 26.2, and 26.3. | Modrinth lists compatibility with Minecraft Java Edition versions 1.16.2 through 1.16.5, 1.17.x, 1.18.1 through 1.18.2, 1.19.x, 1.20.x, 1.21.x, and 26.1 through 26.3. |
| Mod loaders | The listing names Fabric, Forge, NeoForge, and Quilt as supported platforms. | CurseForge lists Fabric and Quilt as supported mod loaders. |
| Modrinth reach | The Modrinth listing shows 133.9 million downloads and 11.7 thousand followers. | Modrinth reports 44.1 million downloads and 5.8 thousand followers for Krypton. |
| Support | The project directs users to report issues through its GitHub issue tracker and links to a Discord server. | Support is provided on a best-effort basis, and the maker does not guarantee stability, compatibility, or support for every setup. |
| What it does | ImmediatelyFast is an open-source Minecraft client mod that accelerates immediate-mode rendering. | Krypton is a Fabric mod that optimizes Minecraft's networking stack and entity tracker. |
Plans
In their own words
ImmediatelyFast
ImmediatelyFast is a free, open source Minecraft mod that improves client-side rendering performance in Minecraft: Java Edition. It batches draw calls using a custom buffer and sends data to the GPU more efficiently. Its optimizations cover entities, block entities, particles, text, GUI and HUD, maps, and immediate mode rendering used by other mods. The project supports Fabric, Forge, NeoForge, and Quilt, with compatibility listed for Minecraft versions 1.18.2 through 1.21.x and versions 26.1.x, 26.2, and 26.3. It is designed to work with most mods and modpacks, but names OptiFabric, OptiFine, LunarClient, and LabyMod as incompatibilities. The project says it can improve FPS when the CPU is the bottleneck, with slower CPUs benefiting more than very fast ones. A configuration file in the Minecraft instance’s config folder offers performance or compatibility options. The mod is licensed under LGPL-3.0-or-later, and developers can consult API documentation. The project links to a GitHub issue tracker and Discord server for support.
Krypton
Krypton is a free Fabric mod that optimizes Minecraft networking and entity tracking, with its performance work directed mainly at servers. It works on both clients and servers, including dedicated servers. Its network handlers are based on optimized Netty handlers from the Velocity proxy, using native code where appropriate. Flush consolidation is intended to reduce server CPU use and tick times and lessen the impact of speculative-execution hardware vulnerabilities. Other small optimizations target memory use and packet serialization speed. Krypton is tuned for Linux, though it should work wherever Minecraft can run. CurseForge lists Fabric and Quilt as supported loaders. The project aims to work with Fabric API, Lithium, and Sodium; compatibility with other mods is best effort. It is licensed under LGPL-3.0-only, and the maker does not guarantee stability, compatibility, or support for every setup. The project is described as feature-stable, while updates for newer Minecraft versions depend on the maker's availability and need. Listed compatibility includes Minecraft Java Edition versions 1.16.2 through 1.16.5, 1.17.x, 1.18.1 through 1.18.2, 1.19.x, 1.20.x, 1.21.x, and 26.1 through 26.3.