Ex how do you define the installable icon for the Add to home screen icon ? Or how do you choose what gets in the cache for offline access ?
PS : this is your score https://www.webpagetest.org/result/200227_PT_b799b0e13e0417b...
* https://www.webpagetest.org/result/200227_RM_75b0bc807f4fc90...
Great questions.
> Ex how do you define the installable icon for the Add to home screen > icon ?
Pep tries to source the default icon from the site itself, eg a high resolution favicon, if possible.
If unavailable, or a different icon is preferred, the user is prompted for one. But by default, Pep tries to source such data and information the best it can.
> Or how do you choose what gets in the cache for offline access ?
Requests are observed, in the ServiceWorker, to determine which assets are requested on different pages and across the whole site. Those observations are turned into confidence scores, per asset, to determine which assets should be cached (and pre-fetched if not already cached).
You can, of course, pin certain assets for offline caching 100% of the time. But, by default, Pep does its best to cache requisite resources as determined by observed site activity.