# Optimisation scene

**URL:** <https://forums.chaos.com/t/optimisation-scene/54017>\
**Category:** Issues\
**Tags:** optimisation, glossy, refraction\
**Created:** [June 2, 2015, 1:33pm UTC](https://forums.chaos.com/t/optimisation-scene/54017 "2015-06-02T13:33:52Z")\
**Posts on this page:** 1\
**Showing post:** 3

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**Author:** ![CLAN\_VFX](https://avatars.discourse-cdn.com/v4/letter/c/71e660/32.png) [@CLAN\_VFX](https://forums.chaos.com/u/CLAN_VFX)\
**Post date:** [June 2, 2015, 2:23pm UTC](https://forums.chaos.com/t/optimisation-scene/54017/3 "2015-06-02T14:23:43Z")

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> [@Golden Chrysanthemums](https://forums.chaos.com/t/golden-chrysanthemums/47684/7):
>
> which version of vray are you using? rendertimes? machine spec? test frame we can see?
> 
> hard to advise with so little information.
> 
> bear in mind you are basically describing a really heavy scene. not everything can be made to render fast. glossy refraction is an absolute killer, and you are adding DOF and moblur on top of that. (on a side note, in most cases, you can use one or the other, only specific cases need dof -and- moblur, since both blur the scene)
> 
> did you try using refraction interpolation?
> 
> id say since everything is blurred, id lean towards low subdivs and let the image sampler handle it.
> 
> id also suggest trying the fixed image sampler, but it depends on how blurry everything actually is.
> 
> this is where a sample image would help.

Thanks for the reply!

My vray version is 3.00.03. Render times vary a lot, but are all very high, from 18 to even 40 hours per frame on i7 3930K.

I tried refraction interpolation but it introduced a lot of flickering.

I even tried to turn off DOF and MB altogether but render times are still high (not as high, tho, but pretty high still)

I agree that the main problem is in the glossy refractions, any advice on how to improve on that?

I’m attaching some sample images. Again, thank you very much for the help! 🙂

 ![Frame_01.jpg](https://europe1.discourse-cdn.com/chaosprd/original/3X/d/6/d6330dc379368e91315ed76847307cb31815ad46.jpeg)  
 ![Frame_02.jpg](https://europe1.discourse-cdn.com/chaosprd/original/2X/d/d12e7fe5d047b4cb525b9d952cf01a5e065662c8.jpeg)  
 ![Frame_03.jpg](https://europe1.discourse-cdn.com/chaosprd/original/3X/0/b/0b1126ae052de63633f0a321b69643cff5464c84.jpeg)

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