Reflex AntiLag
by Tythee
Players with a GPU bottleneck get a smaller input delay from Reflex AntiLag, a client-side mod that paces frame submission to the GPU.
What it does
When the graphics card is the limit, vanilla Minecraft lets the CPU run well ahead, so draw calls queue one to three frames deep in the driver. The mod puts the CPU to sleep at the start of each frame and wakes it just as the GPU becomes idle, so the finished command stream is submitted at that moment. The queue empties, and input is sampled as close to display as the hardware allows, without a loss in frame rate.
The mod is client-side only, so players install it and servers need nothing. It requires Cloth Config API. Builds are published for Fabric, Forge and NeoForge, and the Fabric and NeoForge files cover the 26.x releases up to 26.3, with the latest Fabric file dated 2026-10-09. The Forge line targets 1.20.1 and later releases. The code is closed, under All rights reserved, and the source is publicly linked.
Key features
Queue drained to zero
Command submission is aligned with GPU idle time, cutting the driver backlog to a sub-millisecond error.
Input sampled after sleep
The sleep happens before input polling, so the first action after waking is reading the mouse.
Timings from live measurements
Pacing values come from measurements taken during play, so no manual constants need to be set.
F3 pipeline timing graph
The F3 screen charts each stage of the frame and shows a signed alignment error for how closely pacing landed.
Vendor-independent pacing
The pacing works on NVIDIA, AMD and Intel hardware under both OpenGL and Vulkan.
Gallery
Compatibility
Latest build for each game version and loader.
26.x5 of 5 versions with builds
1.21.x12 of 12 versions with builds
1.20.x6 of 6 versions with builds
Only full game releases are shown. This mod publishes no snapshot builds.
Requirements
Dependencies declared by the latest file for each loader.
Required 1
How it compares
Low Latency is a client-side open source mod under the GNU Lesser General Public License v3.0 only, with builds for Fabric and NeoForge covering 26.1 – 26.2. FramePace is also client-side and open source under the MIT License, but only for 26.2 on Fabric and NeoForge. Mercurizer is client-side, Fabric-only and not open source, under a custom license, for 1.21 – 26.3.
| Mod | Loaders | Game versions | Environment | Updated |
|---|---|---|---|---|
| Reflex AntiLag | Fabric, Forge and NeoForge | 1.20.1 – 26.3 | Client-side only | 2026-10-09 |
| Low Latency | Fabric and NeoForge | 26.1 – 26.2 | Client-side only | 2026-06-28 |
| FramePace | Fabric and NeoForge | 26.2 | Client-side only | 2026-08-17 |
| Mercurizer | Fabric | 1.21 – 26.3 | Client-side only | 2026-10-14 |
Questions
Does Reflex AntiLag need manual tuning?
Does Reflex AntiLag work on NVIDIA GPUs only?
Does Reflex AntiLag work with shader packs?
In the catalog
Reflex AntiLag is one of 3,545 Optimization mods on ModsFinder, and one of 2,575 Optimization mods for Fabric. 8,071 mods support Minecraft 26.3.
Similar mods
What the author says
NVIDIA Reflex-style frame pacing for Minecraft — on ANY GPU. 在 Minecraft 中复刻 NVIDIA Reflex 的帧对齐低延迟 —— 支持任意显卡。 Client-Only • Fabric & NeoForge • NVIDIA / AMD / Intel • OpenGL & Vulkan
Official listing
- Modrinth page
- modrinth.com/mod/reflex-antilag
- Owner
- Tythee
- Published
- 2025-02-08
- Updated on Modrinth
- 2026-10-09
- Facts verified
- 2026-10-15