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If GPU Compute is greyed out in the settings, You are NOT using your GPU. Choose one of these from system settings other than "None". : r/blender
Can't enable GPU rendering with Cycles in Blender 2.83 - Technical Support - Blender Artists Community
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Very slow GPU rendering in Cycles (opencl). Blender 2.81 - Blender Development Discussion - Blender Artists Community
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