Hi!
First of all, great scenery!
To my problem: When I'm nearing KORD during approach or departues, FSX starts freezing. The freezes last ~2 seconds with ~5 seconds between them. This also happens when sim is paused and you pan around. My PC is powerful enough, this should not be a problem. Leaving the vicinity of KORD around 5-6NM final 13 the freezes stop. KORD scenery is FSX standard.
As I have the same issue with Aerosoft Zürich/LSZH, so I don't think this is directly linked to the KMDW scenery, but maybe you have a hint for me..