What hurts performance most- Linking or Importing Cavecad files

[Fishmonger]

All other reasons, preferences and needs aside, which of these puts the most drain on a Revit project file?

[Joef]

You are not being very clear. What is CaveCAD?

[Fishmonger]

My bad, I meant to ask about Linking or Importing Autocad files.
I can't imagine where the cave cad reference came from.

[David Haynes]

Importing AutoCAD files hurts performance most. If you must import, avoid exploding the import (that really hurts performance and file size).