Refrax

Refrax is a performance and feature-focused Minecraft shaderpack for Iris.

Swamp

Performance benchmarks (GTX 1650 Ti, 1080p, 16 chunks)

Profile	Target FPS
Potato	160+
Low	125+
Medium	90+
High	65+
Very High	40+
Extreme	25+
Overdrive	~20

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).

Supported versions:

1.18.2 and higher versions should all work just fine.

Unsupported versions:

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.

Installation

Install Iris.
Copy the Refrax.zip to .minecraft/shaderpacks/ or the shader folder of your launcher's instance.
Select the shader in the Iris menu and enjoy!

License

See LICENCE.txt.

Credits & inspiration

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.