My mac is a macbook pro 2017, with AMD Radeon Pro 560.
Seeing this question How to do GPU rendering on MacBook Pro 2016 (AMD Radeon Pro 460) I also get the Cycles render to work, but it renders at slower speeds than the CPU, an intel core i7 2.8ghz.
I have set the render settings in Preferences to OpenCL, and the Scene device settings to GPU Compute. It still takes nearly 3 secs to render all 32 steps with the startup cube just set to Rendered View.
CPU settings: 1.07 sec GPU settings: 2.82 sec
Is this just AMD not being implemented for macOS or is the Radeon Pro 560 not so Pro after all?