Hi @ansks,
All your questions sound similar in that case and I’d refer you again to the post at Have a widget not trigger an immediate update? for a comprehensive discussion on approaches and possible solutions.
One way to do it is to put all your heavy calculations behind an st.button().
if st.button('button'):
... heavy calculations ...
If there is something that is not working for you after following one of the approaches please let us know!
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