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This question already has an answer here:

Firstly, sorry if that's a stupid question. I'm kinda noob :P The thing is that "normal" rendering with GPU is slower than rendering in preview. I made sure that the resolution in which I render is the same as in the preview but it's still slower as if it was rendered with CPU.

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marked as duplicate by cegaton, Ray Mairlot, Timaroberts, Shady Puck, David Feb 18 '17 at 15:03

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  • $\begingroup$ I'm confused - are you saying that rendering with GPU is slower than rendering with the CPU or slower than doing a preview render (with OpenGL)? $\endgroup$ – UnholySheep Feb 17 '17 at 8:41
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    $\begingroup$ OpenGL Render will be faster because it uses a different rasterization technique that uses a lot of shortcuts. Also, the materials aren't applied to it. The rendered viewport shading is also different from a final render because it sacrifices a lot of features for speed. Most notably, it uses dynamic bounding volume hierarchy to accelerate it and is one of the reasons the sampling looks weird in this viewport shading mode. $\endgroup$ – Anthony Vanover Feb 17 '17 at 9:49
  • $\begingroup$ @UnholySheep Slower that preview render. $\endgroup$ – hiya Feb 17 '17 at 9:54
  • $\begingroup$ I forgot to mention that I mean rendering using Cycles. $\endgroup$ – hiya Feb 17 '17 at 9:56
  • $\begingroup$ @hiya If you need to add more information you can use the edit link below your question. $\endgroup$ – Ray Mairlot Feb 17 '17 at 13:20
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Use rendering CPU to GPU, it can be faster then GPU

Change Render Setting Use thisenter link description here

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If you are rendering more colors, change to sampling to 200 to 10

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