Optifabric Mod (1.21, 1.20.5) – Run Optifine On the Fabric, Shaders for 1.14+

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Optifabric Mod (1.21, 1.20.5) is a mod that can be used to run Optifine on the Fabric. It does this by taking the official Optifine mod and making it compatible with the Fabric Modloader at runtime.

Source: Optifabric Mod (1.21, 1.20.5)