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I wanted to see if you can populate a range all at once from an array when using closedXML instead of populating a single cell at a time. Also, if it is possible to set a range from an array, would that be faster than looping through cell by cell and populating each cell?
You can try to insert data as a DataTable and see if it will speed up document creation. But as I can see in source code, there is no optimisation possible whatsoever against single cell population (but I can be wrong).