Garbage collection & memory management causing app to run poorly on iOS 7

Sorry I post the same question but in the wrong forum (I posted it in the Flash Player Beta Channel).

Hi, I am currently working on a game built using Air SDK v. 3.8 that is running fine on iOS 6. However, since the release of iOS, sometime it becomes unresponsive. When profiling with Adobe Scout, the problem seems to have something to do with the garbage collection. In Scout, some GC pass could take up to few seconds on iOS 7, while it would never take more than 700 ms on iOS 6.

I've tried to compile the project using the new 3.9 beta, and the result is somewhere in between what we've got on iOS 6 and iOS 7 (1-2 seconds).

I'm wondering if this is something that you are aware of, and if there's a fix (or optimisation) around the corner. Thanks a lot.