Denoiser slows down rendering.

[J.C]

Enabling denoiser slows down rendering and viewport responsiveness even if one GPU is assigned only for denoising. It's clearly visible in scenes with geometry higher than 0.5 mln triangles.

[vijay]

Enabling denoiser slows down rendering and viewport responsiveness even if one GPU is assigned only for denoising. It's clearly visible in scenes with geometry higher than 0.5 mln triangles.

Please make sure denoise on completion option is enabled. Interval denoising is only required in when rendering a region. If region render is your case or if you need interval denoising for testing then increase the Max. denoiser interval settings.

[J.C]

Please make sure denoise on completion option is enabled. Interval denoising is only required in when rendering a region. If region render is your case or if you need interval denoising for testing then increase the Max. denoiser interval settings.

It is enabled and still nothing changes in speed and responsiveness.

[J.C]

Here is the screencast with the recorded issue.
I set one card to do only denoising (GTX970) while the other two (2 x GTX980Ti) are for rendering and tonemapping.

[vijay]

We internally enable around 20 render passes (diffuse, reflection, etc) for denoiser input. The slowness is happening because of the huge additional memory that needs to be transferred between the host and device. We are working on a new denoiser model that will work with very few render passes to solve similar issues.

[J.C]

Ok, I see. Thank you for explanation.

[coilbook]

We internally enable around 20 render passes (diffuse, reflection, etc) for denoiser input. The slowness is happening because of the huge additional memory that needs to be transferred between the host and device. We are working on a new denoiser model that will work with very few render passes to solve similar issues.

Were you able to come up with a new denoise model. It slows down rendering a lot. Thanks