Hi , thanks for your answer.
I made a model viewer for space ships taken from Star Citizen. The program only has to handle those static models, but they are very big nevertheless. It took a long time to import all the models in UE one by one. Anyway this has become even more a problem now that I’m trying to upgrade my project from UE 4.6 to UE 4.9. When I open the project in UE 4.9, the editor seems to try reimporting all the models and the process never completes.
So this project has become too big to handle, I think I’ll move to Unity. It produces smaller files, is faster to import models and allow assets packages to be deployed independently.