it seems to be a known bug to a certain degree of course(AA is not recommended to be used anyway)
It only appears when these conditions are given:
-using Anti Aliasing
-starting mission from parking place
-starting completly alone from parking place(whole airfield needs to be free of other starting jets,no matter if starting afterwords or before)
-it doesn't matter if other planes are allready in air
-starting engines will result in 1 to 2 fps and broken heat blur effect
-using 2048x2048 skins(maybe)

My version: 1.02 + Modman installed some

but.... got rid of that bug finally... somehow...

edit:
I uninstalled my display drivers, used drivercleaner, then installed some new chipset drivers for my mobo, installed display drivers again and then I started playing:
first with original skins only, but now everytime starting the mission from parking place, I first push "page down"(decreasing/engine off) and then page up to start engines increase throttle to 55% and voila no fps slow downs anymore.
I don't know if it was the new mobo drivers or this totally non-logical way of starting an engine.
Maybe this might interest others having the same problem.

no need for any help anymore the search option/forum archive did a good job

thanks

This message has been edited. Last edited by: bonzora,