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

Question

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.

Answer 1

I am also seeing this.
Here are screenshots of Scout profiling the same sequence in my game on iPad 2 iOS 7 vs iPad 2 iOS 6.   The initial burst of activity is a loading sequence, followed by automated gameplay.
iOS 7: Please note the position of the red line on the graph, and the time associated with garbage collection.
iOS 6:
Ignoring the "loading sequence" section, the "vertical line" garbage collection spikes on the iOS 7 screen shot are on the order of 2-5 seconds (garbage collection time) each.  The biggest spikes in the iOS 6 screen shot are all < 50 ms in comparison (again, note the position of the red line on the graph). 
Earlier in the day I captured a few garbage collection spikes on iOS 7 that were > 10 seconds each, with the largest being a whopping 24 seconds.
Any insights, supporting evidence, or alternative theories are appreciated.
UPDATE: I tested an iPad3 iOS7 today and did not experience this behavior.
UPDATE: I tested with another iPad2 iOS7 and did see the behavior on that device as well.