Preparing game data before every startup of the game

Hi, everytime i start the game, a dialog appears and says “preparing game data” followed by a very slow download of 600 MB.
i found a similar issue in the hots forum but no working solution.
what can i do?
btw: i’m running battle.net on steamos/proton if that helps.

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이거 왜 아직도 해결이 안됨? 블리자드 일 안하냐?