Just made some test...
I find VAS decreases to a rather low level.
With:
Orbx Global Base
Fly Tampa EKCH
PMDG 737-700 NGX
My traffic 2013 - Airline: 25%, GA:15%
I see VAS drop to 500-600 free
EKCH settings:
Scenery objects:
Apron Lights effects: On
Animated winsocks: On
Vegetation:
Autogen trees: On
Apron detail:
Apron detail :Min
Parking vehicle density:
Parking vehicle density: Normal
Animated jetways:
Animated jetways: Random gates
Animated AESLite traffic:
Apron: On
Oeresundbridge: On
Finn Jacobsen