FPS drops when tapping anywhere on the screen

Have had this problem since I first started with mobile apps. Any solutions? I've searched thoroughly and can't find any answer.
I add an FPS displayer to the app to keep track of the FPS (btw, is capitalized FPS only used for First Person Shooter or also the Framerate?, should the framrate be "fps"?, alsways wondering that ). Wherever I tap the screen, the FPS drops. I don't even have to have any other code, so it's not even a button I tap. It can be in an empty black space and it just makes the game run slower. Even if I remove the FPS displayer and just add the smallest code needed to move an mc from the left side to the right and tap the screen fast while it moves, it moves stuttery and/or slows down. If the screen is not touched, it can take it 5 secs to go from left to right, if I tap the screen as fast as I can while it moves, it can take up to 8+ secs before it gets to the right side.
So, what's up with this slowdown when the screen is touched in Adobe Air mobile apps? Been like this since the very first Adobe Air/SDK version I used, and right now I'm using the latest one (3.7). And it happens both with GPU and CPU. If I don't tap the screen furiously, the stuff runs great and good framerate. In some cases it also slowsdown if I just hold the finger down on the screen and moving it around. But then it usually have to be on something, not just blank space.
I surely can't be the only one.

Bumping this thread. I'm building an AIR kiosk app (AIR 14.0 for Desktop, Windows 7 PC, Samsung LS24C770TS monitor), and am experiencing a similar issue as Tenchy.
If the user quickly taps any visible MovieClip (even MCs that don't have any touch event listeners) in my app, it causes severe lag in other touch events. Odd thing is that the frame rate is not affected by tapping fast, it's just that other touch events are delayed while tapping non-interactive MCs.
Referencing the thread below, I've tried both mouseEnabled = false and mouseChildren = false, on the non-interactive MCs. This doesn't fix the issue. The touch objects and non-touch objects are not deeply nested.
severe frame rate drop when touching screen iOS
Has anyone found a solution for this issue?

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