– Unlike older RTS games, SC2 loads unit models, textures, sounds, and effects just before the match starts, not during the loading screen. This is when your PC shoves those assets into RAM.
technical bug where the game client downloads redundant data (often around 600MB) every time it is launched. While usually discussed as a troubleshooting topic, an essay on the subject might explore the technical hurdles of maintaining legacy software, the complexities of modern game distribution via the Battle.net launcher, or the scientific preparation of game data for AI research. Reddit +1 The Technical Phenomenon: The "Preparing Game Data" Bug For many players, this screen is an obstacle rather than a feature. It is characterized by slow download speeds (often capped around 100–500 KB/s) regardless of the user's actual internet bandwidth. Blizzard Forums +1 The Language Synchronization Theory starcraft ii preparing game data
Press Windows Key + R , type %APPDATA% , and delete the and Blizzard folders. Repeat this for %LOCALAPPDATA% and %TEMP% . – Unlike older RTS games, SC2 loads unit