360 3d render issue

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1

a render question, 2.81:
360 @ 1080p, 17 seconds.
360 @ 4k, 52 seconds.
360 3d @ 1080p, 27 seconds.
360 3d @ 4k, 17 minutes.
Any reason?

thanks for any info or fix!

2

info found here

https://developer.blender.org/T73701