If your in-game settings are set to a language not fully downloaded via the Battle.net launcher, the game tries to pull that data at startup.
The "Preparing Game Data" message reappeared, overlaying the match. > DECRYPTING SECTOR 7. starcraft 2 preparing game data
To better understand the causes of this issue, let's take a closer look at each of the potential culprits: If your in-game settings are set to a
If preparing data for a custom map or mod (Galaxy Editor): To better understand the causes of this issue,
It is fair to question why a mature game like StarCraft 2—over a decade old—still suffers from this issue. The answer is technical debt. StarCraft 2 was built before modern patching systems (like delta patching used in Fortnite or Valorant). Blizzard’s CASC system is powerful for data integrity but notoriously slow for random access.
Because .SC2Replay files are proprietary and compressed, the first step of preparation is parsing. You cannot simply open them in a text editor.