When I use in Cycles the Cycles Preview Render (Z) it takes way longer to render than in the normal Render (F12). E.g.the standard cube needs in normal Render (F12) 1.2 Seconds to Render but in the Preview Render (Z) over 12 Seconds! So working in Blender does not make fun. OpenCl is activated.
Im working on a iMac with an i5 7600k and an Radeon Pro 580.
Thanks in advance Matti