Insanity ShaderShaders · 1.8 – 1.21A stylized, horror themed Iris shaderpack with high customizability and performance.

Refrax is a performance and feature-focused Minecraft shaderpack.
Opens Modrinth · 6,924 downloads there
Refrax is a performance and feature-focused Minecraft shaderpack.
Refrax is a shader pack made by Coredex. It supports Minecraft 1.18 – 26.x. It has been downloaded 6,924 times on Modrinth. The last update came out on Aug 8, 2026.
Refrax has had 9 releases on Modrinth since Jul 8, 2026. 9 of them came out in the past year. The newest is 1.3.1, released on Aug 8, 2026. It is made for Minecraft 1.18.2 – 26.3. It runs on Iris. The download is 11.7 MB.
| Version | Released | Minecraft | Type |
|---|---|---|---|
1.3.1 | Aug 8, 2026 | 1.18.2 – 26.3 | Release |
1.2.3 | Aug 8, 2026 | 1.18.2 – 26.3 | Release |
1.3.0 | Aug 8, 2026 | 1.18.2 – 26.2 | Release |
1.2.2 | Aug 8, 2026 | 1.18.2 – 26.2 | Release |
1.2.1 | Jul 31, 2026 | 1.18.2 – 26.2 | Release |
Refrax is a performance and feature-oriented Minecraft shaderpack for Iris.
NOTE: This is for v1.3.0:
Profile · Target FPS
Potato · 120+
Low · ~90
Medium · ~70
High · ~55
Very High · 40+
Extreme · 25+
Overdrive · ~20
NOTE: This is for v1.2.2:
Profile · Target FPS
Potato · ~160
Low · ~120
Medium · ~80
High · 60+
Very High · 40+
Extreme · 25+
Overdrive · ~20
NOTE: Both benchmarks were taken using the exact same scene.
I saw a ~25 fps boost on 1.18.2, 20+ fps boost on 1.20.1 and ~15 fps boost on 1.21.1.
These values can be bumped higher by changing the performance mode slider at very little visual compromise even at overdrive performance mode (You'll only notice it in certain situations. It mainly reduces the sample count of clouds, god rays, AO, SSR, and water wave octaves, most noticeable of which are reflections and water which will be tuned to be less noticeable in the future).
1.18.2 and higher versions should all work just fine.
1.16.5 - No colored lighting and no block breaking particles.
1.17.x, 1.18 - Does not load the shader
1.18.1 - Does not render a lot of blocks.
See [LICENCE.txt](LICENCE.txt).
Refrax is original source, inspired by Photon, Complementary Reimagined, Bliss,
Solas, MakeUp Ultra Fast, Super Duper Vanilla, published graphics research, and
the Iris shader documentation.
Written by Coredex. Read it with pictures on Modrinth.
Install Iris (with Sodium) or OptiFine for your Minecraft version: shaders need one of them.
Download the .zip file from Modrinth. Do not unzip it.
In Minecraft, open Options, then Video Settings, then Shader Packs, and click Open Shader Pack Folder.
Drop the .zip file into that folder, pick Refrax in the list and click Done.
Shaders are heavy on the graphics card. If the game gets slow, pick a lower profile in the shader settings.
| Resource | Downloads | Versions | Last update | Price |
|---|---|---|---|---|
| 6,924 | 1.18 – 26.x | Aug 8, 2026 | Free | |
| 8M | 1.8 – 1.21 | Jun 13, 2024 | Free | |
| 488K | 1.8 – 1.21 | Feb 10, 2026 | Free | |
| 12K | 1.16 – 26.x | Aug 16, 2026 | Free |
Yes. Refrax supports Minecraft 26.x. All supported versions: 26.x, 1.21, 1.20, 1.19, 1.18.
Yes. Refrax is free to download from Modrinth.
Yes. The last update came out in the past day.
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