Why my Excel file is slow to open?
When I upgraded to newer version of Excel, I noticed that my Excel file take longer time than usual to open. It is not only one reason for slow performance. There are so many other reasons behind this. Let's discuss the most common problem area: Large Calculation If an Excel file contains large number of calculation then it will take more time in opening. So the best way is to turn off Automatic Calculation option. To turn off this option; follow below steps: Go to File → Options → Select Formulas → WorkBook Calculations → Select Manual.