[BMPV SS4] versus [Microstation SS3] very to slow open

Hi,


I've got a dgn file with 162 sheet models, with microstation SS3 it's take around 5 sec to open and with bentley map power view SS4 (French)  it's take around 5 minutes or fail.

Any idea why? because this file has to be use on computer with bmpv ss4

NB :   i will upload the file soon [edit here the file]FDP-200.dgn


thanks

Regards Arnaud