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so i have been carping and asking about this for a while now and the answers i´ve gotten made me think i was going insane.
the official word was: the performance is the same across the board between plugins. and that makes sense, its the same core.

however the experience i have had with unreal (and cinema4d) far surpassed that of blender in terms of speed (and workflow too but i will shut up about it)
i kept hearing here how octane is very fast but before i switched to unreal i felt octane is much slower than cycles in direct comparison. e-cycles vs octane was a joke.

in any case, i am fed up now and decided to do a quick test to get some proof that something is severely broken:

i have exported the scene from blender to unreal and c4d end aligned the values.
the comparison is viewport only and just aproximative because i wasted enough time on testing out blender plugin as it is.

the actual rendered region is infact larger in UE and c4d so if the comparision is biased, its towards blender.
i added c4d although i havent really updated octane plugin in a long time, still beats blender by a country mile aswell.

just look at the screenshots.

other problems with blender:
- the blender plugin is extremely slow. something i will get difference around 500% (UE was 10 seconds and blender in some instances up to 48 seconds)
- the render speed fluctates wildly. i wrote about this in a separte post. here again i have 100samples rendering at 24 seconds and 200 samples at 22secm then 200 at 35 sec.
- denoiser with camera will straight up not work all the sudden. either it stays 0 or cant move after a certain value. (screenshot 22seconds_nodenoise.jpg)


before i go on a tirade again, i really want to hear how any of this makes sense.

since ue and c4d perform well, its obviously not some driver issue.
the problem is blender plugin as i was saying for some time now.

it is, in this state, unusable. this is not a hyperbolic in the least.

here is the scene, same one i uploaded in the other thread:

https://we.tl/t-35f0ulPRUG

My tests prove something different. Blender Octane, Standalone and Octane plugin for Cinema 4d render the same time.
https://www.dropbox.com/s/wcstd6qxb56gp ... blend?dl=0
In your scene it is a bit is different. It always renders 14 sec vs 12 sec on Standalone/C4d. Not much difference. I did some scene cleanup to make sure it renders properly.
Bear in mind that if you use modifiers Blender has to apply them before rendering, it may take some time before actual rendering starts.
https://www.dropbox.com/s/6yxte2m6mpq26 ... blend?dl=0

thanks jc.

i found the issue and to wrap it up am posting this across the threads:

so after much struggle i have fixed this.
i think the problem was octane trying to authenticate token. it kept repeating every few seconds and i think it influenced the performance negatively.
all it took was reinstalling blender and now i get much better performance.
the system analitics tool still comes up with some strange reports but the support says, if it works its fine.
very happy about it and looking forward working with blender octane.

i was very critical of octane especially in the context of e-cycles. comparing it head to head, e-cycles was a clear winner and i was puzzled by the claims of octane superior speed.
now i finally get have octane running as it should, happy to say. it was driving me insane.