Marker to highlight which actors are featured in other movies

Would it be possible to add a dot near an actor’s photo if they acted in other movies in the library?

That would mean that the server would have to make all the database queries (which are normally only made after clicking on the actor’s photo), right when you enter an item’s preplay page.
And that not only for one actor, but at least for as many actors which are initially visible on that preplay page.
So, an already expensive database query will get multiplied. Needless to say that this will delay the time before the preplay page is fully rendered by a very large factor.
All for a little dot which will get ignored most of the time by most of the users.

So, in the interest of avoiding unnecessary database queries and upholding a speedy server response, I think this is not a great idea.

In the case that you don’t know what I am talking about with the “one click on an actor’s photo”, please peruse this: https://support.plex.tv/articles/discover-credits/

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I was thinking more of a simple flag and a single query when the library is updated.

Or maybe a flag AND a counter, for all those cases when a movie with the specific actor it removed.

The point is that with movies with large casts, loading each actor’s profile is a tedious affair. Knowing in advance that you DO have other movies with the same actor would be a QOL improvement for more people than you realize.