Bug] (1.16) Using Sildur's Vibrant shaders my Minecraft is locked at 30fps, and without shaders it's locked at 60 · Issue #4202 · sp614x/optifine · GitHub
Minecraft is not using enough resources; Lags with shaders... - Java Edition Support - Support - Minecraft Forum - Minecraft Forum
Low fps with shaders. GTX 1660 Super : r/Optifine
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