If you have huge number of complex formulas in your workbook and it takes long time for workbook to calculate the formulas everytime you enter a new formula, you can use below quick method to overcome this challenge.
1) Change the calculation to “Manual” mode
2) Enter the new formula or do any activity which normally requires all formulas to re-calculate
3) press Shift + F9
This will calculate and update just the current worksheet only and it will be done faster as compared to entire workbook calculation.