Viewport frame-rate drop

[cds]

First of all, thanks a lot Ahmet Oktar for all the hard work.

I am having a weird issue with the responsiveness of the c4d viewport after updating my GPU.

I work on an Apple iMac with an Akitio Node TB3 EGPU. I just updated my GPU from a GTX 780 to a GTX 1080 ti and now when I run octane, my viewport becomes very unresponsive. It seems that for some odd reason the Open-GL engine switches over to the EGPU instead of using the internal GPU of the iMac, or octane is trying to use the AMD?? I did not have this issue when I was on the GTX 780. Needless to say, when I check the preferences, under Open-GL it shows that it is using the Radeon (internal) GPU but the viewport performance really drop while running octane. Things resolve when Octane is paused or not running. I made a quick video displaying the issue:

https://vimeo.com/240624560/279c1140f0
or
https://www.dropbox.com/s/zc805mwl24ebn ... m.mp4?dl=0

I would really appreciate your help as this is cased the update to really slow down the workflow.

[bepeg4d]

Hi cds,
please, post a screenshot of Octane Settings/Other panel, thanks.
ciao beppe

[cds]

Thanks bepeg4d,

there are some shots of settings as you can also see in the video. Are there any settings that could affect the performance of the viewport in cinema4d outside of the octane viewer?

[aoktar]

Try this parameter.

[cds]

Thanks for your reply Ahmet, I tried it with or without that option, turning it off maybe changed it a little bit but it's very unnoticeable and the viewport is still very unresponsive.
I also tries with different kernels etc to no effect.
I made a short video with more screenshots of the settings, Any ideas?

https://www.dropbox.com/s/v5il575m2hjq4 ... 2.mp4?dl=0

screenshots of the settings:

[cds]

Also I don't know if this helps or not but I realized that this problem only affects the viewport that is being rendered, other viewports function as normal:
Video
https://www.dropbox.com/s/yncdk5wmgtb66 ... 3.mp4?dl=0

[cds]

Also one more thing I discovered is that if the scene is heavy enough, the viewport functions well when octane is calculating, so when it's updating the scene viewport is smooth and then it gets laggy. Video the show the effect:

https://www.dropbox.com/s/ikufzq33tge0x ... 4.mp4?dl=0

I would really appreciate any help.
thanks

[cds]

Try this parameter.

I would really appreciate if you could have any advice about this issue.

[barokt]

Hello I have exact same problem in my iMac Pro Late 2017 with AMD Pro Vega 64 with eGPU Sonnet 1080ti external GPU...
Synchronization on geo. updates helps like 8-9 fps. otherwise viewport fps is 2-4 fps. when I turned off that tab it's get 10 fps.
Without all of that my normal fps like 200-300. Something wrong but I cannot figure ot out like everybody. Thank you for your helps.