App PSS does not impact your app directly. PSS - Proportional set size is basically the processes shared between your app and others running in the background. (https://appachhi.com/blog/understanding-android-performance-the-market-and-problems/) When PSS exceeds a specific amount of threshold, there are possibilities of Android system killing the apps that are OnPause() state. This means the user would lose the data (If entered) and might have to start from the beginning which is not a great user experience. More App PSS also means that the app could be using background services (Network, Google play services) to communicate with the server. There are high chances of battery drain which makes it important to keep an eye on App PSS.