Need to check what takes time, how to optimise...
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Description
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- first step, adding Loader for DialogChooseLevel in Menu.qml -> https://invent.kde.org/education/gcompris/-/commit/b6cd6c412a7adf2494286da2c806bba37cf6565e
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Seems we can't load dataset in parallel as they are created via the QQmlEngine and it needs to create its data in its own thread