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I'm using Cycles to render a simple scene that consists of a simple house (4 cubes and 1 plane), which contains some furniture (see my file http://www.pasteall.org/blend/35552 ). Normally, using direct lighting allows me to reduce the render time considerably. So I fixed the bounce max and min to 1. I used path tracing integrator and limited global illumination as Light Paths option.

enter image description here

I have not used any texture image for the furniture. I used just a diffuse material (diffuse BSDF node).

The rendering time is 20 s/ frame on CPU i7 dual core and 8 GB RAM. I think it is too long for direct lighting. Any comments?

enter image description here

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For direct lighting in Cycles, you need to set bounces to 0, not 1, as done by the Direct Light preset. There is a bounce of indirect light in your render.

If you want to get performance closer to Blender Internal direct lighting, you can switch to branched path tracing, lower AA samples to e.g. 8, and increase the samples on the individual lights and world as needed to reduce noise.

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  • $\begingroup$ thanks for you response, I have reduced the time complexity but the image is very noise. What did you mean by "and increase the samples on the individual lights and world as needed to reduce noise." $\endgroup$
    – BetterEnglish
    Commented Apr 11, 2015 at 3:28
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    $\begingroup$ If you enable the branched path tracing integrator you can go to the light and world properties to set the number samples for each. $\endgroup$
    – brecht
    Commented Apr 11, 2015 at 23:40
  • $\begingroup$ I read carefully the blender wiki in this link wiki.blender.org/index.php/Doc:2.6/Manual/Render/Cycles/… and I found that "Setting it to maximum 1 bounce results in direct lighting. " So, It was an error in blender wiki or what? $\endgroup$
    – BetterEnglish
    Commented Apr 21, 2015 at 15:25
  • $\begingroup$ Yes, it was a mistake in the wiki. $\endgroup$
    – brecht
    Commented Apr 22, 2015 at 18:43

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