When using Plex-Web (currently version 4.79.4), the ‘PLAY’ row seems to be loading and sometimes takes a very long time to appear.
Here’s a screenshot showing what I mean:
It’s a behavior that’s recent, I don’t remember ever seeing this loading icon before for that row. It used to display instantaneously. This is all local content.
I assume this is related - when in a Library view, the ... dropdown (bottom-right corner of a movie poster) can also take a while to load, and momentarily displays a spinner.