Strange fsx problem

[vorox144 1]

SPECS 

 

i7 2600 3.5

gtx550 ti

8gb ddr3 

 

PLANE USED AIRBUS X EXTENDED

 

 

Recently was testing PC in frankfurt with the aerosoft eddf scenery    and i was looking for ways to increase fps around frankfurt with the aerosoft scenery I get around 17-24 FPS

 

so i was curious what fps i would get with defualt fsx scenery at EDDF Frankfurt........ turns out I get exact same FPS maybe 1 or 2 more (MAYBE)   

 

I want to know how is that possible and what must be the problem .... How can i recieve same fps at default Eddf then in Aerosoft eddf 

 

any other scenery i have like  FOR INSTANCE I TESTED aerosoft Barcelona 25- 30 fps on my rig with airbus x  and when i turned of BARCA  and used default i got major 45 to 50 fps increase

 

I wanna whats wrong that i am not getting a fps increase  with the default scenery 

 

 

BTW I USE 
 

TWEAKS 

 

REX OD

 

and I used same time and weather settings in both TESTS 

[Angels40 17]

There are certain default airports in FSX that are classified as high detail airports.   I know EDDF is one, and usually my FPS drops a few frames here every now and then, but when I'm clear of the airport, or facing the wild blue yonder, FPS jumps back to 30.   Here is a list of high detailed airports:  http://www.simtours.net/highdetailairports.php

 

Chris