Hi Janne, it's probably worth it to try turning off the automatic join on import (uncheck Options > Import/Export > IGES options > "Join surfaces on import") and see if that helps you get the file in more quickly.
Also depending on how the file is structured it may be necessary to turn it off anyway, if for example you have a lot of separate objects that were touching each other originally those may get joined together in bad ways with some unwanted pieces of neighboring parts getting joined together. If that's the case you will need to turn off automatic joining and do a more guided manual joining process of selecting targeted pieces and using Edit > Join after doing the import.
- Michael
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