Motion Blur increases Rendertimes per frame... still

[KeeWe]

Hi,

I'm kinda baffled this is still a problem in 2025. I have a rather simple scene with a character and a native C4D hair setup. I change the motion blur settings to transform/vertex on the hairs since it doesn't work at all with the normal transform mode. So far so good, it looks good and renders smoothly. BUT: it increases the rneder time each frame significantly... see the attached screenshot.
I can live with the higher render time due to the MB because the looks justify it, but adding 30 seconds per frame is just a joke and not feasable for this project.

Is there anything I can do to prevent this?

I also include my render settings. I usually max out parallel samples and us max tile sample of 16, but this triples the render times... god knows why. It all fits in the VRAM. Network render is on as well with one node connected.

Lates C4D and latest octane 2024 build (2024.1.2-(R4)

Thanks for any help.

Cinema_4D_THcts7XIMW.png (12.68 KiB) Viewed 768 times

Edit: Can't upload a different screenshot, not even in a new post... it only displays the one already uploaded.

Cinema_4D_PJRNj86mGD.png (12.68 KiB) Viewed 767 times

[bepeg4d]

Sorry but I cannot reproduce the issue, rendering time with hair+motion blur is not constant, but it doesn't increase by 30 seconds per frame here.

Maybe something else?

Btw, unfortunately I cannot attach a screenshot, there are some issues on the forum at the moment, but the team is working on it.

ciao,
Beppe