The most important things that slow the ME down are terrain elements that are not created wisely. What are you using on your map, esp. tracks, polygons, ...
Which one do you use?
IIRC, there has been a Hungarian (?) track package which is heavily overloaded. We do not recommend to use those tracks, since they crash the ME ( 
) and later the Simulator. Florian has created some tracks that are high quality and do not crash the apps. Have a look, if you want: Florians Ansammlung sammelwütiger Objektsammlungen
There is a feature in the MapEditor which allows you to replace one track kind with another one. But I currently can not tell what's its name or where to find. Maybe someone else is able to...
Argh, sorry, I see. He has to accept the new agreement 
I'm going to ping him. Sorry für the confusion
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