HELLO,
I have two experience with flutter.
I work for a company for one year.
I have experience with android development before start switching to flutter.
I write clean code with performance awareness.
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I installed your app and test most of features, and I think the problem of slow loading data is not related to firebase.
Fetching data from firebase is so fast and I think maybe there is another issues.
I can improve your app performance and figure out all issues.
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THANKS.