android performance is very very poor !!! please help ...

Hello guys
We are developing an application for both android and ios
It's kind of big and has complicated coding and lots of Images , Loaders , etc ...

in ios it's almost ok , but in android its crappy slow !!!
I mean , it takes like 15secs to even run the app .

I'm using adobe flash cc 2015 - adobe air 21
I have set the render mode to GPU - I'm using greensock tweens .
I have lot's of vectors , bitmaps as well

I was thinking about moving to starling framework , do you think it helps ???
If yes , which codes should move there ?
I mean should i use every single code that starling gives me for all of the parts ?
Touch listeners ? or Loaders ? or ?
I need to know these because i don't have a lot of time , and it's a loooot to change so
what's the most affective in memory management and performance ?

Please let me know if you have any tip
It's really important
Thanks a lot
Sam