Found the problem it is the Salva button block, even just opening the backpack with that block in it causes CPU overload and page freeze.
This will need re-working, it is highly repetitive in any case
I cleared some blocks, now it is lighter ...please try to see if you can do something with this version 
Nadi3_updatedbyEla_Lighter.aia (387.2 KB)
"Found the problem it is the Salva button block"
aaah, great!
You may want to consider using listviews/listpickers instead of big displays of buttons for selection, and to use lists to store the selected data, then you are not having to iterate over button states all held in memory to then save. It may not be as pretty, but will be more efficient.
Yes, ... but I want it nice and clear to see 
... for a person who feels his own pulse, collecting data must be very simple and intuitive, so big buttons 
... I think for now I will stay with this version and I will be very grateful if you help me to simplify it as much as possible
yes, I have seen the spinner, ... using listView or other similar packages, is very binding. I have to be free to handle every button. As you have seen, sometimes when I press one button another has to be deactivated, etc.
Then in level 1 of the pulse reading things are very simple, but then in the advanced levels the information will be more complex.
which is why you should use lists, and avoid repetition of button displays 
..by "more complex" I mean that I will probably have to use some drawings, and maybe the buttons will not be a simple list but located in various places on the page ... but I don't think about it yet. For now I would like to conclude this first level, and let the pulse reading practitioners use the app, to test it, ... then I will decide how to proceed.
...do you think you can do something with that file I sent you?
I reduced the big "Save" block ...now everything is faster, but I don't know where to get the "component value" block ...you surely know it
Nadi3_updatedbyEla_Lighter2.aia (381.9 KB)
...do you think that all the images that I have uploaded in my project are too heavy?
Should I reduce Kb?
On the whole they are OK. You could resize your main background: sfondo_home.jpg by @ 50%, all the others are good.
2 Likes
very well, thanks 
...(I wanted to close this topic, so I deleted my last post keeping just the sentences with the solution quoted below.)...
After considering the solutions proposed here, in the end I followed Tim's suggestion to keep everything on the same screen (Screen1).
So I solved it by simply placing the Vertical Arrangement with Table page right after the Home page and setting its height to 100%. In this way, when I click on the List button to display the Table page, automatically the page that was visible in that moment is "pushed down", off the screen, but still active. And when I close the Table page, the previous page returns to the screen with all the selections active that I previously made. It works well for me.
............ 
Thank you all .............
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