ImmediatelyFast Backport
ImmediatelyFast Backport brings immediate mode rendering optimizations to Minecraft 1.16.5 on Fabric, reworking how draw calls are batched and buffered.
What it does
The project backports the ImmediatelyFast rendering optimizations to the 1.16.5 rendering engine. Because older versions use different rendering internals, some implementations were rewritten or adjusted rather than copied directly. The aim is to reduce CPU overhead during rendering by batching draw calls and handling buffers more efficiently.
Optimizations reach into how entities and block entities are drawn, along with particles, text and the GUI or HUD, plus certain vanilla rendering paths where that is possible. The original mod is the base, and the goal is to keep its most useful optimizations while preserving stability and compatibility for players who still run 1.16.5.
The mod is client-side only, so only the client needs it and servers run without it. It is released under the GNU Lesser General Public License v3.0 only and is open source, with the source code publicly available. Files are published for Fabric on 1.16.5, and the latest file is the mc1.16.5-backport build from 2026-05-17.
Key features
Batched draw calls
Draw calls are grouped together using more efficient buffer handling to lower the rendering work done each frame.
Entity and block entity rendering
Optimizations cover how entities and block entities are drawn, including targeted changes to certain vanilla paths.
Particle, text and GUI rendering
Particle, text, GUI and HUD rendering are included in the set of rendering paths the mod works on.
Adjusted for 1.16.5 internals
Several implementations were rewritten to fit the rendering engine of 1.16.5 rather than copied from newer versions.
Compatibility
Latest build for each game version and loader.
Only full game releases are shown. This mod publishes no snapshot builds.
How it compares
FPSFlow is also client-side only and open source under the GNU Affero General Public License v3.0 only, but it targets 1.21.11 – 26.2 rather than 1.16.5. Sign Fix is client-side only, open source under the CC0 1.0 Universal license and published for 1.21.5 – 26.2. Players on 1.16.5 have no alternative in this list that covers that version.
| Mod | Loaders | Game versions | Environment | Updated |
|---|---|---|---|---|
| ImmediatelyFast Backport | Fabric | 1.16.5 | Client-side only | 2026-05-17 |
| FPSFlow | Fabric | 1.21.11 – 26.2 | Client-side only | 2026-07-29 |
| Sign Fix | Fabric | 1.21.5 – 26.2 | Client-side only | 2026-03-25 |
Questions
Does ImmediatelyFast Backport need to be installed on servers?
Which loader and version does ImmediatelyFast Backport use?
Is the source code available?
In the catalog
ImmediatelyFast Backport is one of 3,545 Optimization mods on ModsFinder, and one of 2,575 Optimization mods for Fabric. 5,992 mods support Minecraft 1.16.5.
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What the author says
ImmediatelyFast Backport brings immediate mode rendering optimizations inspired by ImmediatelyFast to Minecraft 1.16.5 Fabric. The mod improves rendering performance by batching draw calls and using more efficient buffer handling to reduce CPU overhead during rendering.
Official listing
- Modrinth page
- modrinth.com/mod/immediatelyfast-backport
- Owner
- assemblycsharp
- Published
- 2026-05-16
- Updated on Modrinth
- 2026-05-17
- Facts verified
- 2026-10-15