The recently released version actually takes an excessively long time to render.

[2741126277]

I encountered a very difficult problem during the production process. When I was using C4D 2023 (Arnold 4.7.9) for rendering the same project, it took 2 minutes and 51 seconds. However, when I used the latest versions such as 4.8.5 and 4.8.3, it still took 59 minutes and was still not completed.

[Stephen.Blair]

Hi Anonymous

Is it just IPR? Or is Render to Preview Window, or render to disk, also slower?
It would help if you could get an Info-level Arnold log for a completed render, because that show a time-based breakdown

[2741126277]

Thank you for your help. Yes, I only tested IPR because the duration was too long and I didn't attempt to render it into the window. To obtain the Arnold log more quickly, I adjusted the project settings (the camera sampling AA was changed from 3 to 1) (the global light sampling was cancelled) (the rendering proportion of the IPR window was adjusted to 30%). After completion, the rendering time was 11 minutes.

[thiago.ize]

Your log says pretty clearly that you are slow because of your textures. 98.84% of the time is textures:

00:11:21 17075MB | top frame self-times by category
00:11:21 17075MB | AiTextureHandleAccess 8:22.11 (98.84%)

This is because you are not using tx textures. Enable autotx and it should get nice and fast.