Compiling USD with FX caches

[mathieu]

Hello,

I am experimenting usage of USD and karma on a renderfarm. For my purpose I did an explosion test with pyro.

1-I cached the explosion to bgeo files.
2-I did a simple scene import node in my stage scene and add a karma render setting node.
3- To output my USD I add a USD render node to write it to disk.

I noticed that houdini takes a lot of time to re-write extra files for volumes in a dedicated folder even if the bgeo files are already on disk.

My point is  :
Is there a way to prevent houdini to rewrite that kind of heavy caches ( bgeo already on disk ) during the export of the usd ?

Thanks !