New Post: Copy Worksheet is very very slow

        private static void Main(string[] args)
        {
            var wb = new XLWorkbook();
            foreach (var sheetNum in Enumerable.Range(1, 200))
            {
                CreateSheet(wb, sheetNum);
            }
            wb.SaveAs("saved.xlsx");
        }

        private static void CreateSheet(XLWorkbook wb, Int32 sheetNum)
        {
            using (var ws = wb.AddWorksheet("Sheet " + sheetNum))
            {
                // Fill sheet
            }
        }