One problem with IVAO. When installed, It dumps a huge amount of AI aircraft in your folder.
It then take minutes rather than seconds to select an aircraft.I have solved this, by going thro the list and deleting(after making a backup)all the ones I thought were unnecessary, I then, went throught each aircraft, and reduced the number of variations, to one or two, some of the folders had plus 150 variations!!!! I think the average was about 60.
No wonder it took so long to change aircraft. It is now back to around 5 seconds for the aircraft menu to pop up.