I have some scripts that use Excel to present the result of data validation tests and I was becoming a little frustrated at the length of time it was taking to write the data to excel, using _ExcelWriteSheetFromArray() function in the Excel.au3 UDF. So I thought I'd take a look and see if I could improve on it's performance. This was the result. This new function is 200 to 300 times faster than _ExcelWriteSheetFromArray() for large arrays (20000 plus elements) and in the region of 100 times fas