The time taken to install your application and get it prepared for live usage by your customers is a critical phase in your customer relationship. They are obviously keen to get their hands on your new and improved releases as quickly as possible. Careful planning and awareness of which of the components you are using are packable and upgradeable are important to monitor the effort involved at this stage.
When exploring the various platform features available to you, it is important to check whether the related component type can be packaged or not. For a full list of components that can be packaged, search for the Available Components section in ISVforce Guide, referenced in the previous chapter.
https://developer.salesforce.com/docs/atlas.en-us.packagingGuide.meta/packagingGuide/
