If you are repeatedly stuck on this screen, the following strategies from the Blizzard Technical Support Forums and community discussions can help:
Thus, it:
Here’s a breakdown of what it is and how to resolve common issues. starcraft ii preparing game data
where the game client re-downloads files during launch, and a scientific process for training AI agents using game replays 1. Scientific Paper: Preparing Game Data for AI Research If you are repeatedly stuck on this screen,