Hello Erel!
Thank you (as always...) for your response!
No, I'm not loading any images!
The page that causes the problem is preloaded on Activity_Create
This page has 2 layouts preloaded and I show and hide the proper layout simply setting as visible the corresponding background panel.
The most shown layout has one preloaded Google Map on a parent panel, 10 labels on a parent panel and 4 buttons on a parent panel...
I've noticed that after 3-4 times that I show this page, the memory use is increasing to ~250-300 MB from ~100 MB of the initial loading of the app.
These devices have the slow down problem when the memory is reaching this amount of use.