Yes, I certainly think so—or at least, that is the feedback I receive. In my performance reviews, my professional expertise and the quality of my work consistently fall within the above-average range. The quantity of my work, however, falls into the below-average range.
A colleague once remarked that I was a "walking encyclopedia." Personally, however, I don't see myself that way.
I have also already tried to leverage this very strength as a selling point. I was told that while this is indeed a nice asset, the field I work in ultimately places the priority on sheer volume.
Consequently—once again—I am currently trying to look around for positions that would be a better fit for me.

Thank you very much for your detailed response. There are several points where I can empathize deeply. I am sorry that the day of the tour ended on such an unpleasant note.
My diet is balanced. I don't eat excessive amounts of meat; it is largely plant-based.
I work these extra hours because, generally speaking, I take longer to complete my tasks—though, in return, I am more thorough in my field. I try to compensate for the reduced output resulting from this by working overtime. Unfortunately, my work can also be time-critical, as other people depend on my decisions.
That is, in fact, part of the reason why I work overtime. I, too, tend to get lost in the details of a problem or a case. At least, that is how my manager describes it. I see it somewhat differently—actually, much in the way you describe it in the paragraph above. I can relate to that so well. The mere fact that you, too, apparently feel this way gave me the sense that I am not alone—or simply stupid. Thank you!
Edit: changed "team meeting" to "tour" at the beginning.