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Situation : I've got a DGN file with 162 Sheet Models. With MicroStation v8i (SELECTseries 3) it takes around 5 seconds to open, but with Bentley Map it takes around 5 minutes or fails altogether.
Tip : There is a configuration variable that you can add which will turn off Dynamic Feature Scoring, which will speed things up significantly with large DGN Files.
MS_GEOXFM_NO_DYNAMICSCOREDFEATURES=1
Note that enabling this variable will inhibit some Bentley Map functionality.