The best and clean way would be to Check Instance Master Hidden in the 
visibility properties of the instance master geo as Rob has rightfully pointed 
out. I don't think a Hidden Instance Master would slow down arnold. 

Sent from my iPhone

> On Feb 4, 2014, at 14:10, Stephen Blair <[email protected]> wrote:
> 
> Hi
> 
> A visible instance master will be included in the scene bounds. I don't know 
> that it will slow things down, but it could "skew the BVH build 
> inappropriately, perhaps".
> 
> 
> On Tue, Feb 4, 2014 at 12:36 PM, Eric Thivierge <[email protected]> 
> wrote:
>> Some renderers like Arnold I believe will count that within the bounding box 
>> of the scene and may make some loading / calculations slower from what I've 
>> heard. Feel free to correct me Mr. Blair. :)
>> 
>> Eric T.
>> 
>>> On Tuesday, February 04, 2014 11:44:55 AM, Cristobal Infante wrote:
>>> Good to know!
>>> 
>>> I do however like to move my master instance to a different location
>>> in the scene. It's easier to tweak them this way ;)
> 

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