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Slow rendering time.

lucasnglifelucasnglife Posts: 2
edited 12:41AM in Technical Help (nuts n bolts)

There have been other discussions on this topic here on the forum, but my problem is different from the others. What usually happens is that a standard render on my system (I’ll list the specifications below) takes 10–12 minutes, rendering images at a resolution of 1920x1080 in a standard scene containing objects, lighting and two Genesis 9 figures.

The problem occurs occasionally, where the scene takes between 40 and 60 minutes to render, using the same scene, lighting and figures.

I use Nvidia Iray as the engine, in photorealistic mode, with CPU fallback disabled and CPU unchecked in devices. The GPU is identified correctly.

Using the CPUID HWMonitor software, I identified differences in the GPU’s performance in both cases. CPU usage remains constant throughout both.

 

| ITEM                                 |     NORMAL RENDER       |    SLOW RENDER    |

| GPU Power Consumption |          140W to 150W         |              ~60W           |

| Temperature                      |                   ~80°C             |              ~56°C           |

| GPU usage                        |                 100%                |               100%           |

| VRAM usage                     |            98% to 99%           |          96% to 99%      |

| Frame Buffer                     |            69% to 74%            |            2% to 6%       |

| Bus Interface                     |                 ~60%                 |              ~16%           |

| 3D Usage                          |            94% to 100%           |         56% to 100%    |

 

There is a notable discrepancy in some itens, where even though the GPU reports that it is using 100% of its capacity during rendering, it does not utilise its full processing power to complete the task, resulting in a significant increase in the time between interactions during rendering. This problem occurs in both Daz Studio 4.24.0.4 and Daz Studio 6 – beta version 6.25.2026.14722.

The only solutions I have found for the problem so far have been to close the Daz Studio application, clear the RAM using RAMMap, and reset the graphics card driver using the shortcut Win+Shift+Ctrl+B. If that doesn’t work, try resetting the graphics card using the command (nvidia-smi --gpu-reset) in the system terminal, or, if that doesn’t work, perform a full reboot of the operating system.

I’d like to know if other users are experiencing this or if it’s just me. This problem persists even after reinstalling the software, the operating system, in both the Game Ready and Studio versions from NVIDIA driver.

System information:

Windows 11

DAZ Studio 4.24.0.4 - Daz Studio 6 – beta version 6.25.2026.14722

AMD Ryzen 7 5700X 8-core processor

NVIDIA RTX 3060 12GB

NVIDIA GeForce Game Ready Driver 610.47

64GB RAM

Post edited by lucasnglife at

Comments

  • Richard HaseltineRichard Haseltine Posts: 110,274

    That looks as if soemthing is just tipping the scene over the edge so that it no longer fits into the GPU memory, in which case you will need to restart DS to free it up. Check that you are not leaving a previous render window open as that will keep the memory used. You can see what is being used in the DS log file, near the end after rendering - Help>Troubleshooting>View Log File.

  • lucasnglifelucasnglife Posts: 2
    edited 12:44AM

    Richard Haseltine said:

    That looks as if soemthing is just tipping the scene over the edge so that it no longer fits into the GPU memory, in which case you will need to restart DS to free it up. Check that you are not leaving a previous render window open as that will keep the memory used. You can see what is being used in the DS log file, near the end after rendering - Help>Troubleshooting>View Log File.

     I usually render directly to the file, without opening any windows. Often, even after completely restarting the DS, waiting for it to clear the allocated memory and then opening it again, the problem persists. 

    I’ll try to reproduce the problem by opening a window and leaving it open on purpose.

    Post edited by lucasnglife at
  • lucasnglifelucasnglife Posts: 2
    edited 1:46AM

    lucasnglife said:

    Richard Haseltine said:

    That looks as if soemthing is just tipping the scene over the edge so that it no longer fits into the GPU memory, in which case you will need to restart DS to free it up. Check that you are not leaving a previous render window open as that will keep the memory used. You can see what is being used in the DS log file, near the end after rendering - Help>Troubleshooting>View Log File.

     I usually render directly to the file, without opening any windows. Often, even after completely restarting the DS, waiting for it to clear the allocated memory and then opening it again, the problem persists. 

    I’ll try to reproduce the problem by opening a window and leaving it open on purpose.

     

    I ran the test by rendering to a new window and left it open; immediately afterwards, I started a new render, and as you had anticipated, the problem in question occurred: the rendering was very slow, with intervals of up to 12 minutes between each interaction.

     

    I noticed that it was slower than when the problem I described occurs; as I mentioned, I do not use the method of rendering to a new window, I only render directly to the file. In the log, I found no mention of an open window near the end of the section where the rendering ends. I used the DS 6 for this test.

     

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    Post edited by lucasnglife at
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