Worksheet sheet = ExcelAddIn2.Globals.ThisAddIn.Application.ActiveSheet;
            Range allCells = sheet.Cells;

            Stopwatch addressWatch = new Stopwatch();
            Stopwatch addressLocalWatch = new Stopwatch();
            
            foreach (Range cell in allCells)
            {
                addressWatch.Start();
                var address = cell.Address;
                addressWatch.Stop();

                addressLocalWatch.Start();
                var addressLocal = cell.AddressLocal;
                addressLocalWatch.Stop();
            }

            double addressCoast = addressLocalWatch.Elapsed.TotalMilliseconds;