I have a kind of "Album of photos" document type with a multple media picker to select a group of photos. In the fron end, i want to display take a summary of the photos, maybe grab 1, 2 or 3, and composite them together.

Now my main concern is that i don't wanna loop through MMP images on each time i will display my albums, i wanted a way to cache this inside my document type, maybe a "read only calcualted field" ?

Is it the right approach or am i missing somethng ?