Issue Summary

When a board has a large number of mirror cards (about a 100) it takes too long to load in the Trello mobile app, leading to delays and performance issues for the user.

Steps to Reproduce

1. Have a board with a large number of mirror cards
2. Go to the Trello mobile app
3. Open the board

Expected Results

The board's initial load is done, and the mirror cards are shown in a timely manner.

Actual Results

The initial loading spinner appears, but then the screen goes completely blank without any loading indication until the mirror cards finish loading. This delay takes a considerable amount of time and affects the user experience performance.

Workaround

Currently, there is no known workaround for this behavior. A workaround will be added here when available