Let’s look at an example, shall we? Let’s say that after installing Instagram on your phone, you spend the first ten minutes creating your profile and finding friends. If Google discovers that most people follow the same routine when installing the app from the Play Store, Google will make sure that the first parts of Instagram that get installed from the Play Store deal with profile creation and finding friends. The story viewer and the files needed to post on the app will remain uninstalled until you try to use them or your signal gets stronger. And instead of opening the entire app into RAM at once, Your phone might load only those parts of the app you use the most lowering the amount of RAM being used while reducing the stress on your phone’s processor.
Android users not happy with App install optimization will be able to opt-out of the feature although this will simply stop your data from being used in the crowdsourcing. You will still benefit from the faster install times created when other Android users’ data is collected by Google. Version 25.5.13 of the Google Play Store makes a reference to the feature which means that we could see it hit the Google Play Store soon.