26.3 update slows down Advanced 3D Renderer

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The same scene that took 45 minutes to render in 26.2.1 now takes 2 hours with the same settings, objects and lighting setups. I even made sure Depth of Field is turned off.

Also, light objects in the preview tab cause the project to crash. Had to hide them from the preview.

B

Beaufazo

Participant

I noticed a similar issue upon opening projects as well. A project with a few hundred 3D layers went from ~10 seconds to load the elements to somewhere around 2 minutes.

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Nishu Kushwaha

Community Manager

Hi HieuVu97, thanks for the report. A 45-minute scene taking 2 hours after a point update is a serious performance regression.

To escalate this properly, a few details would help:

1. Your system specs: CPU, GPU, RAM, OS version.

2. Your GPU driver version.

3. Is the slowdown in preview, final render, or both?

4. A sample project (with media) that shows the 45min vs 2hr difference would be invaluable for engineering. Feel free to DM me a link if you'd rather not share publicly.

In the meantime, if you need to finish work on a deadline, rolling back to 26.2.1 via Creative Cloud is a valid workaround until this is addressed.

I'll flag this to the engineering team once I have the details. Looking forward.

Thanks,

Nishu

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HieuVu97Author

Participant

My CPU is a Ryzen 7 5800H, GPU is a Laptop spec 3070 RTX, 32 GB of RAM and latest version of Windows 11.
My GPU driver is also the latest one, I think the version number is 610.62 with a clean install via DDU.
Slowdown in the final render.
Sent via DM

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