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"Extracting Object" slowing render dramatically

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Hi,  I'm using redshift to render a camera moving through some clouds (static).  The clouds are imported with a File node, as they were previously cooked out to disk.  The volume is a reasonable resolution (vdbs are around 300mb each and Im loading 2 of them).    I import the clouds with separate File nodes, and render using one RS light.
The render itself is fast but at the start of every frame, it goes through a "extracting object/...filepath.vdb" process which lasts for > 10 minutes per frame before each frame renders.  What is happening here and is there a way I can reduce this time? Also tried loading .bgeos and have the same problem.

Cheers for any advice :)


Edited by Fireandsmoke

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