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I would try SDF files.
Tony Carcamo
President/Owner
Civil CAD Learning Solutions
DFW BIM Infrastructure User Group
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Coverages affect the terrain in InfraWorks, and that is re-rendered when you import one. Could take a while for large models and large import files.
Potentially your coverages contains geometries with very complex boundaries and tons of vertices (just a guess). This could be cleaned up in AutoCad Map for example.