I recently started Immich and also say the awful lag. But apparently this is due to a slow "album sync" running often on the main thread. Not the fault of flutter.
I don't know how syncing my 200 albums can be that slow but they are a big project to move it off of the main thread.
I'm suspicious of those because it shows an ebay logo but then shows an app I've never heard of or used...is this the same for all the other logos? Where does NYT use flutter?
I recognize that as the NYT Games (formerly NYT Crossword) app.
It has some very annoying non-native behavior, like bringing up the text selection/highlight menu in inappropriate places (in a word puzzle with no selectable text).