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In blender this scene takes around 1 hour to render on cpu with bump mapping enabled but if I change the option to true displacement or microdisplacement it only takes around 2 minutes to render. I think this is a bug because microdisplacement should take longer than bump mapping but instead it's the other way around however using the gpu true displacment does take longer. I was wondering if theres a way to fix this because usually I like to use the option displacment and bump but for some reason it takes much longer than true displacement.

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