: This is the most successful community fix. Ensure your game language and the Battle.net launcher language are identical.
The SC2 API zeroes out enemy resources in the fog of war by default. During data prep, you must track the last observed value and maintain a visibility mask to teach the AI to deal with hidden information.
On a technical level, the "Preparing Game Data" screen serves a specific purpose. Unlike many shooters where maps are pre-loaded, StarCraft II is a highly complex RTS where every unit, texture, sound file, and physics engine rule must be synchronized perfectly across all players in a match.
If your local profile settings are corrupted, the game will freeze while trying to read them. You can reset these settings without losing your online progress. starcraft 2 preparing game data
SSD highly recommended to reduce "Preparing" time from minutes to seconds. Summary Table: Quick Fixes Recommended Action Takes 2+ minutes every launch Move game to an SSD or clear the %ProgramData% cache. Stuck at 0% indefinitely Check Firewall/Antivirus permissions for SC2.exe . Error: "Data could not be prepared" Run the Scan and Repair tool in the Battle.net launcher.
The Blizzard Entertainment cache folder can sometimes hold outdated "indices" that confuse the launcher.
Look for any lingering processes named Battle.net , Agent.exe , or StarCraft II . Select them and click . Press the Windows Key + R to open the Run dialog box. Type %programdata% and hit Enter . : This is the most successful community fix
Press Windows Key + R , type %ProgramData% , and delete the and Blizzard Entertainment folders. Repeat this for %AppData% , %LocalAppData% , and %Temp% . 4. Disable "Auto-Detect Settings" in Windows
Here is a full write-up on what this phase entails, why it happens, and how to optimize it for a smoother experience.
Right-click your desktop shortcut and select Properties . Navigate to the Compatibility tab. During data prep, you must track the last
StarCraft II actively writes variables and save states to C:\Users\YourName\Documents\StarCraft II . If Microsoft OneDrive is actively syncing this folder, it locks the files. This prevents StarCraft II from reading them, triggering the infinite loop.
The "Preparing Game Data" message in often results in a slow download or an infinite loop, usually caused by language mismatch bugs or connection issues with Blizzard's data transfer servers. Recommended Solutions
If you have spent any amount of time launching StarCraft 2 , you have likely encountered it: the infamous screen. It hangs there, often for minutes at a time, with a percentage counter crawling from 0% to 100% before the game’s cinematic or login screen finally appears.