Hi Mark, the file size increase is most likely because of a heavy use of repeated instanced data in the file.
MoI does not currently have any mechanism in it to represent instanced data and so those get converted into separate full object copies at import time, and that can increase the data size by quite a bit.
I do want to add an instancing mechanism into MoI to avoid that from happening but currently that's probably what is going on there.
- Michael
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