No the db is fully loaded and all UI elements are ready before the window is made visible. That's the whole reason there is a splash screen. You can see the sequence of events by running calibre as calibre-debug -g
This thing is some Qt issue in the new Qt version. It's actually much worse when using remote desktop in some scenarios there the UI actually gets stuck with the white window, the UI is actually functional you can click on things and they work, but all you see is the white window. Definitely a Qt issue.
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