Blender 2.8 completely slows down by applied materials in Evee in rendered view #62805
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Reference: blender/blender#62805
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Short description of the test
Rendered view Evee;
4 objects: Cone, Plane, Cube, Icosphere (See uploaded blend-file)
Blender bug-slow.blend
Material settings of cone, make viewport, or actually the whole of blender 2.8 very slow
When deleting cone, Blender returns to normal
When hitting CMD-Z to undo the deletion, it brings back the cone, and Blender slows down again.
When applying the Cone material to the Cube, Blender works fine again (!!)
When undo-ing that, and applying the Cone material to the Icosphere, Blender stays slow
Removing the red cube, makes Blender fast again (undoing that, Blender becomes slow again)
Removing Icosphere, Blender stays slow
Applying cone.material to Icosphere, Blender stays slow
Applying then the cone material to the Cube, then Blender becomes fast again.
Redoing previous steps, results stay the same.
Saving this project and opening it again: Same result
Changing the cone-material itself (giving the subsurface a value of 0.0) speeds blender up again.
Giving subsurface a high(er) value blender is still fast
Going back to the subsurface value of 0.036364 and Blender is slow again...
But the above three steps don't always work that way.
Putting the metallic shader blow 1.0 does the trick and makes it fast again.
Blender 2.8 Beta
March 17 2019
System:
MacOS High Sierra
27 inch, mid 2011
3,4 GHz Intel core i7
24 GB 1333 MHz DDR3
GPU: AMD Radeon HD 6970 2048 MB
Added subscriber: @mdelouwere
Added subscriber: @Jeroen-Bakker
Changed status from 'Needs Triage' to: 'Archived'
Thanks for the report and Sorry for the late reply. This GPU is below the minimum requirements for Blender, so we no longer provide support for it. https://www.blender.org/download/requirements/
Installing the latest graphics driver sometimes helps to make such GPUs work, see here for more information. https://docs.blender.org/manual/en/dev/troubleshooting/gpu/index.html
If that doesn't help, you can use Blender 2.79: https://www.blender.org/download/previous-versions/
Added subscriber: @camot
This bug has nothing to do with outdated GPUs!
You can reproduce it exactly as described on all AMD GPUs installed on any Mac running any version of Mojave or Catalina. From AMD Vega 56, AMD Vega 64, AMD Radeon 555X to AMD Pro Vega II on a Mac Pro 2019.
It is definitely NOT a 'outdated GPU' thing!
Many thanks to the reporter of this bug for his work. You cannot report it any better than that.
Everything is provided for any developer willing to solve the issue.