Again, it does not place all of the item content on the clipboard, just the item IDs and filename. When pasting, the processing will be different if it's a different DB (copy the items and their content, then delete in source DB vs. move of the items within same DB), but the same clipboard data is stored on a cut in both scenarios (has to, because it doesn't know if the paste is going to be into a same or different DB), and the amount of data placed on the clipboard is small and would be fast, whether one or more items.
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