Render speed test with LuxRender 0.6 RC5 for interior design

In the past few days a new version of the upcoming LuxRender 0.6 was released, and now we have a RC5 to test before a stable release is available. Along with several bug fixes, this new release was announced with an improvement in the render speed to previous LuxRender 0.6 RC. Since LuxRender works with progressive refinement to generate the images, and render times can be very long depending on the type of scene rendered, any improvement on the performance of the renderer is welcome. But, since a few users on the LuxRender official forums claimed that render times are almost the same with versions RC4 and RC5, I decided to run a test myself to see if the render speed is shorter with RC5.

For this experiment I`m using the same computer, a dual core with 2GB of RAM and a windows xp with only the basic services running. The computer was left alone rendering for a period of 30 minutes and by the end of the process; we will compare an image created with RC4 and RC5 to check the amount of noise from both renderers. The scene used is from an old project of mine, which was rendered with Indigo Renderer by the time it was still a freeware.

This project was about a visualization of the furniture layout for an interior design project.


After 30 minutes of rendering, this is the result I got from LuxRender RC4.


And the same image rendered with RC5.


If you take a close look on both images, you will notice that in the render from RC4 we have a bit less of noise. My impression here is that RC4 was able to work with more samples in the thirty minutes of render time than RC5. This can be verified with the screenshots from LuxRender, when the render was stopped.


With the RC4 the average of samples per second was a bit higher. Look at the TotS/s values.

The conclusion? Well, It`s hard to take conclusions with only this test, but as a overall impression the render did not get any faster. If that`s the cost of a more stable release, I can live with it! The best thing to do now is to take a scene where you have worked with previous versions of LuxRender and do some tests as well, and take your own conclusions.

Blender 3D Architect Pro


  • Gagar

    Typically, comparing the number of samples per second between two different versions of a renderer (or two different renderers) is not a good metric: It says nothing of the samples’ quality.

    The quality of the render after n minutes is a much better metric, and indeed the only one that counts.

  • Allan Brito

    Hi Gagar,

    I`m aware of that. That was only a way to justify the better quality of the image rendered with RC4. 🙂


  • Alain

    For professional Architectur Vizualisation I can only recommend to wait for the full integration of V-Ray into Blender. V-Ray is not for free, but if you consider how mutch time you loose by rendering with buggy unbiased renderengines, then you must admit that this “5% more realism” of unbiased renderengies isn’t worth of it.

    I still give Blender a chance for a prof. enviroment, cause I don’t like 3d max. Cinema 4D is mutch more userfriendly than Max and could be an alternative as well. But all those Open Source unbiased renderer mostly are unusable for prof. firms.
    I see mostly students, idialists and hobbiests users in those forums who do not really know what the today market wants.

    Kind regards

  • ralmon

    Alain has a very big point. For most part, realism isn’t really that big but speed is. Even if that “realistic” renderer is 50% less realistic than the best out there but is 200% faster it would be be much desirable.

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