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tahnik403893y2 things: roles/permissions and specific listeners.
Make sure that your logged in users are listening to specific node of the database, not all of it.
Nawap15033yNot the solution
There is YouTube channel called TVAC ,and he tried doing chat application using firebase. I think he would have implemented it.
Iam commenting this because, he has good content on firebase.
It may also be helpful to u in future