title: Firebase Cloud Firestore Snapshot listen too fast
body: <p>Hi I'm creating an app in React-Native and Invertase RN-Firebase. I'm using firestore for the first time for my new project. I notice the realtime update 'Snapshot' the behavior seems to listen too fast. I'm worried that this will kill my budget for the billing.</p>
  
  <p>Form my previous experience with Firebase Realtime-Database the update/listening from snapshot was not so fast and it check ever other 4 to 10 seconds which in FIrestore it  listening per millisecond. </p>
  
  <p>let me know if there is a way to slow down the Listening of snapshot for Cloud firestore.</p>
  
  <p>thanks,</p>