This seems an Invenor General question so I would post it in that forum.
I would clean the Autocad drawing as much as possible (use flatten command at the end) and import one geometry / block at a time, no dimensions, border etc. just the geometry.
Don't have one sketch with all the geometry as well. Try and have as many needed (one per feature ideal). When creating new feature, I found that it can hang on geometry selection if you are pointing at the same sketch. The more features you have the slower it is to select sketch profiles from the same shared sketch.
Adrian S.
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AIP2012-2020 i7 6700k AMD R9 370
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