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I have an iMac and I'd like to make it faster. I've made some modifications following some tutorials, but the process is still very slow, and I feel like the real change would be to set GPU instead of CPU; so is it possible to do that on iMac? Is it normal that to render one frame the program takes more than a minute? To render 40 frames I waited for more than 40 minutes..

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    $\begingroup$ 1 frame a minute is really quite fast. With a complex scene and high render resolution, renders can take days or weeks (especially if you stop the render while using the computer for other things). As far as GPU rendering goes, it depends on what kind of GPU your imac has. If it supports OpenCL (or even better, CUDA), then it should be at least possible, but not necessarily faster. See this question for more detail $\endgroup$ – gandalf3 Apr 14 '16 at 18:58
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    $\begingroup$ Rendering takes time. Complex scenes render slower than simple ones. GPU rendering might be faster in some cases, but do not expect miracles. The GPUs on imacs are quite limited, and those that use AMD cards have still have compatibility /drive issues . You can optimize your scene (bake, simplify, remesh, decimate, etc...) but ultimately you'll have to be patient. read: blender.stackexchange.com/questions/24272/gpu-slower-than-cpu and blender.stackexchange.com/questions/46050/… $\endgroup$ – cegaton Apr 14 '16 at 19:55
  • $\begingroup$ Actually it's not a complex scene at all, there is practically an imported character from makehuman and a uv sphere $\endgroup$ – user23221 Apr 14 '16 at 20:04
  • $\begingroup$ Rendering does take time, but check this out as well: blenderguru.com/articles/4-easy-ways-to-speed-up-cycles Changing the tile size, as mentioned, is the only truly affective speeder-upper that has absolutely zero trade-offs. $\endgroup$ – Shady Puck Apr 14 '16 at 20:21
  • $\begingroup$ Change the samples down to increase speed and chance of artifacts and other horrible looking dots. Close programs, and finally keep your imac cool. $\endgroup$ – Luka ash Apr 15 '16 at 0:40

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