We apologize for the instability of composr.app and appreciate your patience. We are working on the statistics addon and trying to find an optimal way to store and render data. Unfortunately, we have yet to find a solution that can handle the traffic (and therefore, tens of millions of statistical records) of composr.app. We're working hard on one.
Already, the entries and categories show with the name of the particular catalogue, and the word 'catalogue' doesn't feature.
The rest seems to be a reference to faceted search, which there is a separate issue for.