If you're like me and have installed planes, boats, etc. to test, and then deleted them:
go to your folder where the REAL active fsx.cfg is, then under folder Simobjects delete any folders with objects you no longer have installed.
Basically it logs the time you have used each. (you can check if you're in the right place, each folder should only have entry - 'state.cfg')
Deleting entries I know I no longer have (leave AI vehicles alone unless you're into AI).
This sped up my aircraft select process screen a lot.
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