Embedded SWF framerate

Hi! This is my first post and my first AIR application, so please be patient.

I developed an HTML AIR application, that embeds an external SWF file.

The external SWF file has 48 framerate and it runs very smoothly in flash player. But when I load it in the AIR application, It seems like AIR is dropping frames, no matter what framerate I configure in window.nativeWindow.stage.frameRate (starting from 48).

Do you have any clue?

Thank you very much

Bye