I open both dbs and sort all entries by ’modified’

It happens on 1st page load, then PWA create a lot of cached data.

It doesn’t happen on other lemmy instances, maybe some, but you can check for example lemmy.ml.

You can check using JShelter Firefox addon. So basically application calls a lot of JS API calls to identify system capabilities even if they are not required by PWA. Results of such calls could be used to fingerprint your browser.

Maybe it is some JS library that checks capabilities to load polyfills?

vs