[Bf-cycles] Blender Viewport performance issue after Cycles render (Example test blend)

David Black db4tech at yahoo.co.uk
Mon Jun 24 04:30:48 CEST 2013

No problem Brecht (received your reply after sending my other two messages).

* Can anyone else confirm this problem?

For any developers interested in testing for this issue, please find a 
link below for a basic example test blend which illustrates the issue 
with recent versions of Blender. My tests were performed with Windows 7 x64.


  * Upon opening the scene, rotating the Viewport view should be smooth.
  * Press F12 to render, once titles begin to appear, press Esc to
    return to Viewport view (does not matter if render completes).
  * Rotating the Viewport will probably now be quite slow.
  * Changing Viewport shading to Texture, then back to Solid fixes any

Rendering with Emitter ticked (Particles panel) and the issue is not 
Testing this scene with Blender 2.67-r57293-win64, Blender 2.67b and 
there is no Viewport slowdown after F12 Cycles render.


PS: Scene is not designed to be accurate or to scale, just a simple 
method of creating a complex object group for this example blend.


On 23/06/2013 23:49, Brecht Van Lommel wrote:
> No, I think we have enough info for now.
> Thanks,
> Brecht.
> On Sun, Jun 23, 2013 at 11:17 PM, David Black <db4tech at yahoo.co.uk> wrote:
>> Would you still like me to test Viewport performance after F12 Cycles render
>> with a GTX 580, once data backup is finished?
>> David
> _______________________________________________
> Bf-cycles mailing list
> Bf-cycles at blender.org
> http://lists.blender.org/mailman/listinfo/bf-cycles

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